Real Alencaster was born in Cádiz, Andalusia, Spain, but was raised in Algeciras, where he lived from the age of one.

[citation needed] In New Spain, Alencaster was a member of the garrison stationed at the Presidio of Santa Fe.

[1] Alencaster was named governor of Santa Fe de New Mexico in 1804 and embarked with his brother from Cádiz to Veracruz on 2 June 1804.

In addition, Alencaster regulated ecclesiastical life: all the priests in charge of various missions had to give mass in the two churches of the province.

In addition, Alencaster cancelled the sale of grain from Río Arriba (although the cereal constituted basic food supply for the presidio of Santa Fe), as well as sheep to the Navajo people.

However, Miguel de Sandoval opposed the measures of Alencater and promoted the maintenance of traditional trade with the Comanches.