- published: 20 Jan 2015
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Francisco de Ulloa (pronounced: [fɾanˈθisko de uˈʎoa]) (died 1540) was a Spanish explorer who explored the west coast of present-day Mexico under the commission of Hernán Cortés. The reports of his expeditions along the Baja California peninsula are credited with being influential in the perpetuation of the 17th century cartographic misconception of the existence of the Island of California.
It is not known whether Ulloa accompanied Cortés on his first expedition to the New Spain. By the account of Bernal Díaz del Castillo, he came to Mexico later while transporting letters to Cortés from his wife. According to some early historians, Ulloa was influential in helping subdue the Aztec capital Tenochtitlan by naval power.
In 1539, at the private expense of Cortés, he embarked on an expedition in three small vessels, sailing north from Acapulco to explore the Pacific Coast, and to seek the mythical Strait of Anián that supposedly led to the Gulf of St. Lawrence, proving the existence of the Northwest Passage. The expedition left on July 8 sailing northwards along the coast and reaching the Gulf of California six weeks later. Ulloa named it the "Sea of Cortés" in honor of his patron. When one of his ships was lost in a storm Ulloa paused to repair the other two ships, and then resumed his voyage on September 12, eventually reaching the head of the Gulf.