Sebastian Brant

Brant, Sebastian (1458-1521) German satirical poet and humanist. His Ship of Fools (1494), a bitter satire on follies and vices of his time,  tells how a ship loaded with fools sails to fool's paradise, Narragonia.
See: Bosch The Ship of Fools is evidently based on the poem. The picture shows two nuns and a monk passing merry time while sailing to Heaven in a company of peasants in a strange boat, which has a May tree (which symbolizes spring folk festivals, a time of moral license for folk and clergy alike) as a mast; banner with a Muslim crescent instead of Christian cross and many other humorous details.