Prince of Achaea in the context of "John, Duke of Durazzo"

Charles I (Italian: Carlo; early 1226/1227 – 7 January 1285), commonly called Charles of Anjou or Charles d'Anjou, was King of Sicily from 1266 to 1285. He was a member of the Capetian dynasty and the founder of the House of Anjou-Sicily. Between 1246 and 1285, he was Count of Provence and Forcalquier in the Holy Roman Empire and Count of Anjou and Maine in France. In 1272 he was proclaimed King of Albania, in 1277 he purchased a claim to the Kingdom of Jerusalem, and in 1278 he became Prince of Achaea after the previous ruler, William of Villehardouin, died without heirs.

The youngest son of Louis VIII of France and Blanche of Castile, Charles was destined for a church career until the early 1240s. He acquired Provence and Forcalquier through his marriage to Beatrice. His attempts to restore central authority brought him into conflict with his mother-in-law, Beatrice of Savoy, and the nobility. He relinquished control of Forcalquier to his mother-in-law in 1248, although she returned it to him in 1256. Charles received Anjou and Maine from his brother, Louis IX of France, in appanage. He accompanied Louis during the Seventh Crusade to Egypt. Shortly after he returned to Provence in 1250, Charles forced three wealthy autonomous cities—Marseille, Arles and Avignon—to acknowledge his suzerainty.

During the late Middle Ages, the two cities of Argos (Greek: Άργος, French: Argues) and Nauplia (modern Nafplio, Ναύπλιο; in the Middle Ages Ἀνάπλι, in French Naples de Romanie) formed a lordship within the Frankish-ruled Morea in southern Greece.

Following their conquest in 1211–1212, the cities were granted as a fief to Otto de la Roche, duke of Athens, by Geoffrey I of Villehardouin, prince of Achaea. The lordship remained in the possession of the de la Roche and the Brienne dukes of Athens even after the conquest of the Duchy of Athens by the Catalan Company in 1311, and the Brienne line continued to be recognized as dukes of Athens there. Walter VI of Brienne was largely an absentee lord, spending most of his life in his European domains, except for a failed attempt in 1331 to recover Athens from the Catalans. After his death in 1356 the lordship was inherited by his sixth son, Guy of Enghien. Guy took up residence in Greece, and in 1370–1371 Guy and his brothers launched another, also failed, invasion of the Catalan domains. When Guy died in 1376, the lordship then passed to his daughter Maria of Enghien and her Venetian husband Pietro Cornaro, who would also reside there until his death in 1388. The lordship became a de facto Venetian dependency during this period, and shortly after his death, Maria sold the two cities to Venice, where she retired. Before Venice could take possession, Argos was seized by the Despot Theodore I Palaiologos, while his ally, Nerio I Acciaioli seized Nauplia. The latter city was soon captured by Venice, but Argos remained in Byzantine hands until 1394, when it too was handed over to Venice.

Charles II, also known as Charles the Lame (French: Charles le Boiteux; Italian: Carlo lo Zoppo; 1254 – 5 May 1309), was King of Naples, Count of Provence and Forcalquier (1285–1309), Prince of Achaea (1285–1289), and Count of Anjou and Maine (1285–1290); he also was King of Albania (1285–1294), and claimed the Kingdom of Jerusalem from 1285. He was the son of Charles I of Anjou—one of the most powerful European monarchs in the second half of the 13th century—and Beatrice of Provence. His father granted Charles the Principality of Salerno in the Kingdom of Sicily (or Regno) in 1272 and made him regent in Provence and Forcalquier in 1279.

After the uprising known as the Sicilian Vespers against Charles's father, the island of Sicily became an independent kingdom under the rule of Peter III of Aragon in 1282. A year later, his father made Charles regent in the mainland territories of the Regno (or the Kingdom of Naples). Charles held a general assembly where unpopular taxes were abolished and the liberties of the noblemen and clerics were confirmed. He could not prevent the Aragonese from occupying Calabria and the islands in the Gulf of Naples. The Sicilian admiral Roger of Lauria captured him in a naval battle near Naples in 1284. As he was still in prison when his father died on 7 January 1285, his realms were ruled by regents. The remainder of his rule was spent seeking a resolution to the Sicilian war, diplomatic moves concerning his inheritance, and administrating the new Kingdom of Naples.

Centurione II Asanes Zaccaria (died 1432), scion of a powerful Genoese merchant family established in the Morea since the marriage of the lord of Chios Martino Zaccaria to the baroness Jacqueline de la Roche. Centurione purchased the rights of the title of Prince of Achaea by Ladislaus of Naples in 1404 and was the last ruler of the once Latin Empire not under Byzantine suzerainty.

Geoffrey I of Villehardouin (French: Geoffroi I de Villehardouin) (c. 1169 – c. 1229) was a French knight from the County of Champagne who joined the Fourth Crusade. He participated in the conquest of the Peloponnese and became the second prince of Achaea (1209/1210–c. 1229).

Under his reign, the Principality of Achaea became the direct vassal of the Latin Empire of Constantinople. He extended the borders of his principality.