In 1548, he was appointed official chronicler of the court of Emperor Charles V.

In accordance with tradition, the street on which he lived was renamed after him when he assumed the role of Mexico City's official chronicler, a post held for life.

Each chapter is followed by an alternate chapter, a short "Fragment of a Chronicle" written by the town's official chronicler.

The appointment of the official chronicler often happens in individuals who have distinguished themselves by their efforts to study, investigate and disseminate population-related issues.

The official chronicler of Mir Jumla also calls the place "Asam".

His name and the quality of several magazine articles that he had written were not sufficient credentials to obtain a position as the official chronicler of the expedition.

The official chronicler of the city, however, still refers to the neighborhoods by their pre-Hispanic term.

And hence everything began to be lived and recounted in a way diametrically opposed to the accounts of the official chroniclers.

Olivares called him to Madrid, where he arrived in 1636, to become the official chronicler to Philip IV.

As official chronicler of his order, he compiled the elaborate Historia de la merced, which occupied him till 24 December 1639 and still survives in manuscript.