John I of Castile
During the 13th century, the area encompassing Colmenar Viejo, "Chozas de la Sierra" and "Porquerizas" (Miraflores de la Sierra) was a source of legal conflict between the provinces of Madrid and Segovia, with John I of Castile incorporating "Chozas" to the municipality of "El Real de Manzanres" in 1389.