English: Church of San Gregorio, Almarza (Spain). The Casa Fuerte de San Gregorio's origin must be sought in the document drawn up in Medina del Campo and dated July 29, 1461, by which King Don Enrique gave Don Diego Lopez de Medrano permission to build this fortified house. Later, under the protection of Don Francisco de Medrano, a Dominican convent was founded in the 16th century, giving up a house and a villa for its establishment. It is a solid square house with a central patio, defended with a barrier, part of which still exists, battlements on its walls and round towers in three of its corners, which still preserve the gargoyles carved in stone and the tubes of artillery pieces of the fifteenth century.