[2] Under his reign, the Principality of Achaea became the direct vassal of the Latin Empire of Constantinople.

[6] Geoffrey was the eldest son of Céline of Briel and John of Villehardouin.

[8] William of Champlitte was prince of Achaea (1205–1209) under the suzerainty of the king of Thessalonica.

[12] The Chronicle of the Morea narrates that Geoffrey only became prince of Achaea some time later.

[13] Next the papal legate Cardinal Giovanni Colonna in 1218 excommunicated Geoffrey I.