The Arrabal of Saint Martin (Spanish: Arrabal de San Martín) was a medieval arrabal (neighborhood) that sat outside the Christian Walls of Madrid. It was located around the location of the current Plaza of San Martín ,[1] and occupied the space between Calle del Arenal , the Plaza de las Descalzas , Plaza del Callao, and Calle de las Navas de Tolosa .[2] It grew as a population center around the Monastery of Saint Martin (adjacent to the Convent of Las Descalzas Reales),[3] neighboring San Martín was the Arrabal of San Ginés , and both were absorbed by the growth of the city in the 17th century.[4]