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