“In these houses of the family property of the family called Mota[2], in the street of the Indio Triste.... These houses were built in the 16th century on a part of the site occupied by the great Palace of the King Axayacatl, where the Spaniards were lodged when first they entered Mexico, which was contiguous (estaba inmediato) with the wall that enclosed the great Temple.” Don Carlos M. de Bustamante adds in a footnote to this passage:—“Fronting these same buildings, behind the convent of Santa Teresa la Antigua, an image of Our Lady of Guadalupe was worshipped, which was placed in that position to perpetuate the memory that here mass was first celebrated in Mexico, in the block (cuadra) where stood the gate of the quarters of the Spaniards.... This fact was often related to me by my deceased friend, Don Francisco Sedano, one of the best antiquarians Mexico has known.” (GARCÍA ICAZBALCETA, note to 2nd Dialogue of Cervantes Salazar, p. 185.) “The Palace of Axayacatl, which served as a lodging or quarters for the Spaniards, stood in the Calle de Sta. Teresa and the 2a Calle del Indio Triste.” So far as I can ascertain, no eye-witness or early historian describes the position of the Palace of Axayacatl, but tradition and a consensus of later writers place it outside the Temple Enclosure to the north of the Calle de Sta. Teresa and to the west of the 2a Calle del Indio Triste. No northern boundary is given. Taking the point A in the line of the Calle de Tacuba as the hypothetical site of the middle of the entrance in the Eastern wall of the Temple Enclosure and drawing a line A-B to the Eastern end of the C. de Arzobispado, we get a distance of about 450 feet; extend this line in a northerly direction for 450 feet to the point C, and the line B-C may be taken as the Eastern limit of the Temple Enclosure. The Northern and Southern entrance to the Enclosure must have been at D and E, that is in the line of the Calle de Iztapalapa. Extending the line B-E twice its own length in a westerly direction brings us to the South end of the Empedradillo at the point F. Completing the Enclosure we find the Western entrance at G in the line of the Calle de Tacuba and the north-west corner at H. This delimitation of the Temple Enclosure gives a parallelogram measuring roughly 900′ × 1050′, not at all too large to hold the buildings it is said to have contained, and not far from Sahagun’s _doscientos brazas en cuadro_ (1012′ × 1012′). It divides the Enclosure longitudinally into two equal halves, which is on the side of probability. It leaves two-thirds of the Enclosure to the West and one-third to the East of the line of the Calle de Iztapalapa[3]. It includes the site of the Temple of Tezcatlipoca. It agrees with the generally accepted position of the Palace of Axayacatl and of the Aviary. It includes the site of the Teocalli, the base of which was discovered at No. 8, 1^{ra} Calle de Relox y Cordobanes.