Maestre de campo was a rank created in 1534 by the Emperor Carlos V, inferior in rank only to the capitán general and acted as a chief of staff. He was chosen by the monarch in the Council of State, and commanded a tercio. Their powers were similar to those of the old marshals of the Kingdom of Castile: he had the power to administer justice and to regulate the food supply. His personal guard consisted of eight German halberdiers, paid by the king, who accompanied him everywhere. Immediately inferior in the chain of command was the sargento mayor. One of the most famous maestre de campo was Julian Romero, a common soldier who reached the rank of maestre de campo and that brought victory to the Spanish tercios in the battles of San Quintín and Gravelines.
In the overseas colonies of the Spanish Empire a governor held the rank of capitán general over his local forces and would appoint his maestre de campo.
Concepcion is a sixth class municipality in the province of Romblon, Philippines.
Concepcion started as a small village founded in 1570 by the Spanish colonization forces led by Martin de Goiti and Juan de Salcedo, upon orders from then Spanish Governor-General of the Philippines, Miguel Lopez de Legazpi. The village was named after the Immaculate Concepcion. Throughout the Spanish era, the village was administered as part of Banton municipality on nearby Banton Island.
On 2 July 1907, during the American colonization of the Philippines, Concepcion was elevated to municipal status but was incorporated as part of Mindoro province after Romblon was abolished and incorporated as part of Capiz province. However, on 10 March 1917, Romblon was reinstated as a separate province, and thus, Concepcion was incorporated back to the province.
On 8 June 1940, the special municipality of Maghali was established upon passage of Commonwealth Act No. 581 (authored by Congressman Leonardo Festin). This demoted Concepcion and Corcuera from their municipality status and incorporated into the new municipality with its capital in Banton. On 26 May 1946, the special municipality was abolished through the passage of Republic Act No. 38 (authored by Congressman Modesto Formilleza), and by 1 January 1947, Concepcion regained its municipal status which it still holds today.