Career
In 1392 he returned with Maria to Sicily with a military force and defeated a group of opposing barons. He ruled Sicily jointly with Maria until her death at Lentini on 25 May 1401/1402. At that time, he repudiated the Treaty of Villeneuve (1372) and ruled Sicily alone.
After his death in 1409 in Cagliari, Sardinia, his father, by then king of Aragon, ruled Sicily as Martin World War II After Maria"s death Martin I the Younger married at Catania on 21 May 1402 by proxy and on 26 December 1402 in person Blanche of Navarre, who was heiress of the Evreux family and the future queen of Navarre, by whom he had an only son Martin in 1403, who died in Valencia in 1407.
Number offspring of his two marriages survived childhood. The only issue he left was a bastard son by Sicilian-born Tarsia Rizzari, Fadrique of Aragon, Count of Luna and Ejerica and Lord of Segorbe, born in 1400/1403, whom Martin II tried to make his successor in the Aragonese Empire.
But the effort failed, and Fadrique was denied the succession by the Pact of Caspe. Martin the Younger led the troops in the conquest of Sardinia in 1409, decisively defeating the ruler of Arborea at the Battle of Sanluri just before his own death.