The first sighting of Koror, Babeldaob, and Peleliu recorded by Westerners was by the Spanish expedition of Ruy López de Villalobos at the end of January, 1543. They were then charted as Los Arrecifes (The Reefs in Spanish).[5] In November and December 1710 these three islands were again visited and explored by a Spanish missionary expedition commanded by Sargento Mayor Francisco Padilla on board the patache Santísima Trinidad.