His father, Jaume d'Alberní i Antolí, was notary public and Honourable Citizen of Barcelona who had married Maria Inés Teixidor on June 24, 1728.
In accordance to Catalan civil law, the oldest brother, Josep Antoni, was named heir to the Alberni estate, including the right to use the title of notary public.
The objective of the mission was to defend the Inner Northern Provinces of New Spain (Provincias Internas del Norte de Nueva España) from the natives' insurgences.
Composed of 98 soldiers under the command of Captain Agustí Callis and three other officials: Pere Fages, Estevan de Vilaseca and the Alberni, they arrived at their destination on August of that same year.
After Veracruz, the Company moved to Guaymas, Sonora, where they arrived in April 1768, after having crossed Mexico City, Tepic and San Blas.
Shortly after their arriving in Guaymas, the company, under the command of Colonel Domingo Elizondo were sent to fight against the rebel natives of Pima and Seri, and participate in a campaign in Cerro Prieto.
The detachment remained in Alta California, stationed at the Presidio of Monterey, and Fages was appointed to succeed Portola as military governor in 1770.
[1] The seizure of the English ships sparked the Nootka Controversy, which almost led to a war between Spain and England over the issue of sovereignty in the Pacific Northwest.
Spain had sent a number of expeditions to the region, starting with the 1774 voyage of Juan Pérez, in order to reinforce the Spanish claim to the entire west coast of North America.
[1] During the trip to Nootka Sound, Alberni was confined to his cabin on the Concepción for 70 days as a result of a dispute with a high ranking Spanish officer.
He also made a registry of recorded temperatures, created a dictionary of 630 native words with their equivalents in Spanish, and brewed beer using conifer bark in an attempt to prevent scurvy.
In short, he built, organized, and administrated the fort and land defenses of the Nootka settlement for the well-being of its inhabitants and the travelers that arrived at its port.
Alberni's sojourn at Nootka coincided with a period of major activity of Spanish explorers and travelers from other nations in the region.
Once Alberni had accomplished his task, and after having been in the fort for two years, he received the order to return with his company to the Maritime Department of San Blas.
He was given, by royal order through the Viceroy of New Spain Revillagigedo, the title of Governor and Commander of Arms of Fort San Miguel in Nootka Island.