Principality of Achaea - The Principality in The 13th Century

The Principality in The 13th Century

Geoffrey I was succeeded by his son Geoffrey II, who ruled until his death in 1245. By confiscating the ecclesiastical taxes, in the years 1221-1223 he built himself a powerful castle at Chlemoutsi, near modern Kyllini, which he used as his main residence. Because of this, he came into conflict with the Catholic Church, and was briefly excommunicated by the Pope. When John III of Nicaea besieged Constantinople in 1236, Geoffrey II came to the aid of the Latin Empire with 100 knights, 800 archers and 6 vessels.

Under his son and successor, Prince William II Villehardouin, the Principality reached its zenith. William was a poet and troubadour, and his court had its own mint at Glarenza, and a flourishing literary culture, using a distinct form of spoken French. In 1249, William II moved the capital of Achaea to the newly-built fortress of Mistra, near ancient Sparta. In 1255 he became embroiled in the War of the Euboeote Succession, and in 1259 he allied with Michael II, despot of Epirus, against Michael VIII Palaeologus of Nicaea. However, Michael II then deserted to join the Nicaean side, and William was taken prisoner at the Battle of Pelagonia. After Michael recaptured Constantinople in 1261, William was released in 1262 in return for Mistra and the rest of Laconia, which became a Byzantine despotate, as well as an oath of allegiance to the Emperor.

However, soon after his release, William broke his oath of allegiance, and begun seeking alliances with and help from various Western nations. Informed by the local Byzantine governor of William's actions, Michael VIII sent an army under the command of his half-brother, Constantine, against William, but the expedition was unsuccessful, the Byzantines first being routed at the Battle of Prinitza in 1263 and then, after Constantine's return to Constantinople, suffering a heavy defeat at the Battle of Makryplagi in 1264.

Despite his successes at Prinitza and Makryplagi, the war with the Byzantines had taken a toll on Achaean resources, and their empire remained a looming threat. A proposal to marry William's elder daughter Isabella to Andronikos, eldest son of Michael VIII, was strongly opposed by the Achaean nobility, who had no desire to come under Byzantine rule. Both William and his overlord Baldwin II, now dispossessed of Constantinople, had hoped for aid from King Manfred of Sicily, who had sent troops to aid William at Pelagonia. But Manfred fell under Papal sanction and was killed in 1266, when Charles of Anjou conquered his kingdom. Charles was now ascendant in Italy, and William and Baldwin came to terms with him in the Treaty of Viterbo (1267). In return for the military aid and funds they so greatly needed, Charles obtained the suzerainty over Achaea from Baldwin, and the Principality itself from William. The latter was to retain the Principality for life, and it was to pass to his daughter, Isabella, who was to marry one of Charles' sons.

These were hard terms, essentially detaching Achaea from the Latin Empire and making it a dependency of the Kingdom of Sicily. Nonetheless, William fulfilled his obligations, leading an Achaean force to aid Charles against the invasion of Conradin at the Battle of Tagliacozzo (1268), and bringing Isabelle to Italy to marry Charles' son Philip in 1271. The military support of Charles allowed William to resist the Byzantines, and the last years of his reign were relatively quiet.

However, after the death of William in 1278, the seeds of a calamitous succession dispute were laid. In the normal course of events, Achaea would have passed to a cadet branch of the House of Anjou. However, his son-in-law Philip had died in 1277 without an heir, and a reversionary clause in the Treaty of Viterbo provided that Charles of Anjou, rather than Isabelle, should this occur. Charles duly took possession of the Principality, which he ruled through a series of baillis; he would never personally visit it.

A renewed commitment by Charles to retake the Latin Empire (Treaty of Orvieto, 1281) was forestalled by the War of the Sicilian Vespers, and this struggle with the Crown of Aragon consumed the remainder of his life. His son Charles II succeeded him in Achaea as well as Sicily (now reduced to the Kingdom of Naples), but was a prisoner in Aragonese hands. In the interim, the rule of Achaea devolved upon a series of baillis chosen from the Morean nobility. Not long after his release and coronation in 1289, he granted the Principality to Isabelle of Villehardouin upon her marriage with Florent of Hainaut, in part to redress the grasping application of the Treaty of Viterbo at William's death. However, he retained feudal overlordship over the Principality, and his grant provided that neither Isabelle nor any daughter who was her heir might marry without his consent.