Fernando de Rivera y Moncada was born in 1711 in Compostela, Mexico. By 1742 he was a member of the military in Loreto, Baja California. As a commander, he assisted in founding the missions of Santa Gertrudis and San Francisco Borja. In 1768, Rivera aided Gaspar de Portolá in expelling the Jesuits from California. In 1769-1770 he joined Portolá in exploring the Monterey Bay area. Rivera retired in 1772, but returned to service as military commander of Alta California, where he dealt with the 1775 attack on the San Diego mission. In February 1776, one of the Indian neophytes involved in the attack confessed and took sanctuary in the building being used as a chapel. Rivera did not recognize this as sanctuary, and was excommunicated by the Franciscans when he removed the neophyte by force. Following a meeting with Father Junípero Serra in Monterey, the issued was resolved and the excommunication was lifted. He was assigned as commander of Loreto for 1777-1779. Rivera was killed on 18 July 1781 during an uprising of the Yuma Indians.
The Misión San Diego de Alcalá was founded on 16 July 1769 as the first of the Franciscan missions in the Alta California region of New Spain by Father Junípero Serra. In 1774 it was relocated six miles away at the recommendation of Father Luís Jayme. The San Diego mission was plundered and burned down by local Indians the night of 4 November 1775; Father Jayme was killed during the attack.
Antonio María de Bucareli y Ursúa was born in Seville in 1717. He served Spain as a military commander in Cuba (1766-1771), before becoming Viceroy of New Spain (1771-1779).