sentence1: The first known European sighting of Whidbey Island was during the 1790 Spanish expedition of Manuel Quimper and Gonzalo López de Haro on the " Princesa Real " .
sentence2: The first known European observation of Whidbey Island was at the " Princesa Real " during the Spanish expedition of Manuel Quimper and Gonzalo López de Haro in 1790 .