Before Paris became Christian, there were several saints and emperors (besides Julius Ceaser) who stayed there. There were; Bishop Saint Denis, Sainte Genevieve, Julien the Apostate who later became Roman Emperor, Roman Emperor Valentinian I, and Saint Martin of Tours that I know about. Then around 250 CE, Lutetia Parisiurum began to become Christian. There are a few important people and events from the next century or 2 but there is much legend and hagiography mixed with the history. Saint Denis, Saint Genevieve, and Clovis are a few of the main characters of this period.
Saint Denis was in Lutetia Parisiurum by 225 CE (I surmise) although the year of his birth is not known. He was martyred in the year 250. He sought to bring Christianity to the region and hagiography states that he was decapitated (for his faith and preaching) on the hill that became known as martyrs' hill (Montmartre) and he then picked up his head and walked with it in his arms for about 6 miles while his head continued to preach about repentance. There are many depictions of this throughout Paris, even on Notre Dame Cathedrals' facade.
Saint Genevieve was born in Nanterre which is about 9 miles to the north west of the island about where La Défense business district now stands. She was born in 419 and died in 512. She is greatly revered by the French and she was actually made the Patron Saint of Paris. Her gravesite is in another of the very first buildings (that still exist more or less intact) that had been constructed in that first suburb of L'îl de Cité, Saint Etienne du Mont. The bridges of the main Roman road that crossed the island had fortifications on the banks on either side of the Seine River which were an integral part of Lutetia Parisiurum but the homes that were being built around Saint Etienne du Mont and Thermes de Cluny were like a village. With the rise of Christianity, there arose other such villages around the island; Saint Germain des Prés (originally called Saint-Vincent until after the first bishop of Paris, Saint-Germain was interred there), Saint-Germain L'Auxerrois, Saint Paul, and Saint Marcel. Around these churches rose communities that were like satellite communities to L'île de la Cité. The most ancient would have been the Basilique des Apôtres and St. Etienne du Mont. Basilique des Apôtres would become Basilica of Saint Genevieve. This became the Pantheon after the French Revolution of 1789.
Germanic tribes started invading the Roman communities along the Seine River and the population decided to retreat back onto L'île de la Cité. They decided to build a wall around a good part of the island and the Roman amphitheater suffered greatly from it because a large portion of the amphitheater was taken apart so its stones could be used for the wall. Moving back onto L'île de la Cité, the people destroyed the bridges and built the wall mostly enclosing the eastern side of the island.
Besides the Germanic tribes attacking Lutetia Parisiurum, there were also the Vikings and the Franks. It was the Franks who eventually subdued all of what is now France. Clovis I was the first to become king of this new kingdom. He was born in Belgium and his father was Childeric I (the king who founded Saint-Vincent church in 453). In 486 CE he defeated all of Roman Gaul. In 511, he makes Lutetia Parisiurum his capital city and renamed it simply "Paris ". His dynasty is known as the Merovingian Dynasty. Clovis I died shortly after he made Lutetia Parisiurum his capital city and renamed it Paris. After his death, his 4 sons divided his kingdom into Austrasia, Neustria, Burgandy, and Aquitaine. Paris, along with Orléans and Tours, were major cities of Neustria. Their Merovingian dynasty lasted until 751 when Pepin the Short deposed Childeric III. The new dynasty of Pepin the Short is known as the Carolingian Dynasty.
The most famous king of the Carolingian dynasty is well known even to me 😄, Charlemagne which is the French version of Charles the Great. He was the son of Pepin the Younger. He united a good portion of Europe and even became Holy Roman Emperor. He ruled France from 768 until 771 as co-ruler with his younger brother until his younger brother (Carloman) died. Pope Leo III crowned him as Holy Roman Emperor on Christmas day in the year 800. Did they already celebrate Christmas by the year 800? I guess that would be interesting to research. Anyway, Charlemagne is also called the Father of Europe and he became devoted to the Catholic church, helping to spread Christianity throughout Europe forcing tribes to convert to Christianity. Louis the Pious became Holy Roman Emperor after his father, Charlemagne, died of old age. The Vikings started rising up and attacking his territory in great numbers because of how Charlemagne had subdivided their Saxon territory that made up what is now called Scandinavia. During this time, the Parisians built another wall on the north bank of the Seine River around what is now Rue de Rivoli and Rue de l'Arbre-Sec. Rue de Rivoli passes along the north side of where the Louvre Museum is now. Rue de l'Arbre-Sec (dry tree street😄) runs along the east side of the ancient Saint-Germain l'Auxerrois church which is just east of the Louvre Museum. Finally, Charles the Simple (Charles III who ruled from 893-923) made a treaty with the Viking chieftain Rollo who later became Rollo of Normandy after becoming Christian, marrying into a noble French family, and showing loyalty to the defense of Paris. These events are actually depicted in the not 100% accurate TV series "Vikings ". Another interesting event in Paris at this time was the creation of a Fun Fair that still exists. It was created in 957 by King Lothair ( or Lothaire) and is now called Foire du Trône.
Between 870 and 990, under the leadership of Charles the Bald, Bishop Gozlin, and Hugh Capet, the bridges Grand Pont and Petit Pont were built and rebuilt and reinforced, defenses strengthened, sieges by the Vikings were repelled, and a siege by Roman Emperor Otto II was also repelled. By the year 1000, the city of Paris was stronger and had hope for the future again.
Around 970, there was the dynasty of Hugh the Great and Hugh Capet. Hugh the Great was the son of Robert the Strong who dominated over a weak and eroding Paris after many years of attacks and sieges. Hilaire Belloc wrote of Paris at this time; "The Norman invasions left behind them confusion and wreckage. Men wondered in the worst of the siege whether the order of things had not changed forever; they doubted whether the empire and the Christian name would stand. As the tide of the sea-men ebbed northward again, the city looked around at desolation only. The mark of the flood was on the ruin of burnt abbeys and on the broken walls; dead men were still unburied in the fields, but the town still stood." It was a Paris in this condition that a military leader of unknown origin like Robert the Strong could create a new dynasty of rulers over Paris.
Reconstruction of several churches like Saint Germain des Prés and Saint Martin des Champs Priory began. In 1014, they began building a new nave for Saint-Germain des Prés and King Henry I commissioned the reconstruction of Saint-Martin des Champs in 1060. The 2 buildings of this complex that still exist today were the nave and the priory refectory. This is where the last trial by combat was held. I wrote about this trial by combat in more detail earlier. It was between Jean de Carrouges and Jacques Le Gris. These 2 buildings that still exist are now the Musée des Arts et Métiers and they are very Gothic and very impressive.
Work also begins on some of the most well known buildings of Paris. And the new architectural style that originated in northern France, the Gothic, is in vouge. We have the Basilica Royal de Saint Denis, which was completed around 1144, the Cathedral of Notre Dame, (replacing Èglise Etienne which stood in its location previously), begun in 1163 and completed in 1345, and the Louvre which was begun in 1190 and completed many times 😃😃😃.
Students began to arrive into Paris to study at the Episcopal school of Notre Dame church around 1010.
Around 1120, many teachers and their students moved from the cloister of the first Notre Dame Cathedral, which was becoming too crowded, to the area around Saint Etienne du Mont church on Montagne Saint Genevieve. Their gathering there for academics began what would eventually become known as the Latin Quarter of Paris where many colleges and universities, some non existing and others still going strong today, were created.
In 1137, Champeaux (little fields) is created as a market place to replace the market area of Place de Grève which surrounded Hôtel de Ville area. This area was the location of Maison aux Piliers before Hôtel de Ville. In 1183, 2 market buildings were built at Champeaux and this market place would latter become the famous Les Halles.
In 1180, The first official college of Paris was founded by an English expatriate named Messire Josse de Londre for 18 impoverished clerical students located in the Hôtel Dieu. The college was called Dix Huit (the College of the 18).
The next major defensive wall that was built for Paris was that of King Philip Augustus. Many remnants of this wall can still be seen throughout Paris. It took approximately 20 years to build it. Paris was one of the last northern European cities to build such a major wall like this one. Hilaire Belloc wrote that "If Paris had never since the Romans given herself a new defense, it was because a kind of doubt hung over the nature of the city." He also wrote that "...by its building a certain kind of seal and termination was put upon the first stage in the development of the city." The commission to build this wall was made around 1190 and Philip Augustus did not stay in Paris to oversee the construction of it. He had departed Paris for a crusade. He also commissioned the building of the Louvre Fortress. So a good portion of Philip Augustus' plans were being executed while he was out fighting during the third crusade. The right bank portion of the wall was completed in 1208. The left bank portion of the wall was completed in 1213.