Malolos was first organized into a formal municipal unit in 1822 when the first "alcalde constitucional" or municipal head was appointed. He was Jorge de Victoria, a Filipino, who like all succeeding "alcaldes", served for one year. He was followed by thirty-one other "alcaldes", with Juan Dimagiba as the thirty-first. In 1859, Malolos was subdivided into three administrative districts; Malolos, Barasoain and Santa Isabel. Juan Dimagiba became the first "alcalde" of the down-scaled Malolos. There were 12 others who served as "alcaldes" from 1859 to 1879, the first one being Mariano C. Cristobal and the second being Capitan Tomas Tanchanco, whose term marked the start of civil turmoil in the town.