Luis de Lossada (1681–1748) was a Spanish Jesuit theologian and philosophical writer.
Lossada was born at Quiroga, Galicia, Spain. He entered the Society of Jesus in 1698, and, after completing his studies, taught theology, Scripture, and philosophy at Salamanca, where he died.
His first publication was the (1720). One year later he published his , commonly styled . This book was an introduction to his , which he published in 1724 (last edition, 10 vols., Barcelona, 1883). It discusses all the branches of philosophy.
Lossada generally follows Suárez, though in some points he departs from his master. Urráburu was an admirer of Lossada's (, I, 8777), and followed him very closely.
Lossada took part in the discussion on the descent of Saint Dominic, and his learned writings on this point were published by the Bollandists in their of 1755.
The satirical vein in Lossada's works led him to be credited with José Francisco de Isla's novel . Lossada and Isla wrote together the amusingly absurd work .
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