Ferdinand arrived in the Principality first, in mid-1315, near the port city
Glarentza, which he took after an early setback. In the following weeks, he proceeded to conquer the plain of Elis, including
Andravida, the capital of the Principality, a conquest which he considered complete by 17 August 1315. It was another few months before Louis was even on his way to the Principality, first stopping in
Venice to procure more aid against the usurper. In the meantime, Louis' wife,
Matilda of Hainaut, travelled directly to the Principality, whereupon she was greeted by a number of local lords, including
John I Orsini, the
count of Cephalonia, and Nicholas of Dramelay, the
baron of Chalandritsa, who repudiated their earlier oaths to Ferdinand and declared for her. In response, Ferdinand attacked and conquered Chalandritsa, but failed to do the same at Patras. It was not long after this that the forces of Ferdinand engaged the forces of Margaret at the
Battle of Picotin, which saw the former victorious. It was about this time that Louis finally arrived in the Principality. After an unsuccessful attempt to capture the castle of Chalandritsa from Ferdinand, Louis moved to
Patras, where his troops were reinforced by
Byzantine forces sent by the governor of
Mistra,
Michael Kantakouzenos. For his own part, Ferdinand expected reinforcements from the Catalans in the Duchy of Athens and from
Majorca, but rather than retreat to
Glarentza to await their arrival, he determined to give battle. ==Description==