Ioannes, Crown Prince of Nicaea (1829 - 1846) was the heir apparent to the Kingdom of Nicaea as the son of Alexios I and his wife Zoe Marina. He was involved in the first war against the Consortium, and died in a battle against the ressurcted Herpo the Foul. He was succeeded in his position as Crown Prince by his uncle Romanos, who would later become Romanos II.