He explored La Plata,
Paraguay and Parana river regions and founded Asuncion in 1537, moving
the colony’s administration there from Buenos Aires.
He served as governor of the Spanish colonies from 1538 to 1540. Cabaza
de Vaca was later appointed governor of the region, but Martinez de
Irala revolted against his leadership, imprisoned de Vaca and had him
deported back to Spain. Martinez de Irala then resumed the role of
Governor of the Spanish colonies from 1544 until 1548.
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