Martin I of Sicily

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Martin I of Sicily (c. 1374 — 25 July 1409), called "The Younger", was King of Sicily from 1390 to 1409.

Martin was the grandson of Peter IV of Aragon and Eleonor of Sicily. In 1390 he married Mary of Sicily. In 1392 he returned with Mary to Sicily with a military force and defeated a group of opposing barons. He ruled Sicily jointly with Mary until her death in 1402. At that time, he repudiated the Treaty of 1372 and ruled Sicily alone. After his death in 1409 in Cagliari, Sardinia, his father, Martin I of Aragon, ruled Sicily as Martin II.

After Mary's death Martin the Younger married Blanche of Navarre, who was heiress of the Evreux family and the future queen of Navarre. No offspring of his two marriages survived childhood; the only issue he left was a bastard son, Fadrique, Count of Luna, 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.