Overview
The Caballerizo mayor (Great Equerry) was the Officer of the Royal Household and Heritage of the Crown of Spain in charge of the trips, the mews and the hunt of the King of Spain.
Regime during the 16th to 18th centuries
The Office of “Caballerizo mayor” was one of the main Offices of the Royal Household in charge of the Royal Stables and everything related to the transportation of the Monarch. When the King sorted out from the Royal Palace, the Caballerizo had the main position behind him and the major rang over the other Court Officials. He managed as well the stables, the carriages and the horses. He was assisted by the “Primeros Caballerizos” (First Equerries) who were nominated by him.
He was in charge of the Royal hunt as “Montero mayor” (Great Hunter) holding, in many cases, the “Alcaldias” (Majorships) of the Spanish royal sites.
From Wikipedia (CC BY-SA 4.0).