The parish of San Martín is undoubtedly one of the oldest in Segovia. Perhaps one day vestiges from before the 10th century can be found.
Segovia claims the feat of the conquest of Madrid in 1083, under the command of the captains Díaz Sanz de Quesada and Fernán García de la Torre, who lie buried in San Juan de los Caballeros. These gentlemen, the "Nobles of Lineages", as they are still called, established the "Los Quiñones" militias in the city to defend it from the successive incursions of the Arabs.
These militias, made up of one hundred horse lances, were endowed with considerable goods in the parishes of San Martín, San Millán, La Trinidad and San Esteban.
In the Chapel of Nuestra Señora del Racimo of this parish of San Martín, the six thousand maravedies of the income of "Los Quiñones" were distributed annually and the new Quiñoneros were admitted, a ceremony that took place on the first Sunday of Easter. This institution lasted in Segovia long after the Reconquista ended and became something honorary. The last data from Quiñón de San Martín appear in 1751.
The earliest documentary references to the temple appear in 1103, regarding the donation of adjoining houses. A document from the Cathedral Archives mentions the temple in 1116 and the historian cites another document from the following year
Apiaries.

Colmenares himself, regarding a book that existed in the temple's library, cites a note that he found written in it and that "The book of Los Morales, translated into Spanish, concludes: Job, written by San Gregorio, copied in the city of Segovia, next to San Martín, this is whose church the book belongs to, in the year of our Lord 1140... That is, which book was copied by Pedro, Abbot of the aforementioned church of San Martín, a man of great simplicity, goodness, innocence and candor and also distinguished in patience and humility, helping him the clergy of said church by supplying the parchment the priest Claveto to Bernardo Franco, who copied the book in the space of a year...
On the walls of the atrium there are several Romanesque tombstones. One of them says:"Hic iacet Lupus Pbro. scriptor et loan. Becerro et M. Salvator Serrano".
Its calligraphy corresponds to the twelfth century and the text recalls three writers, probably clergymen of the parish. Another tombstone from the twelfth century corresponds to the burial of an unknown person, named Rodrigo Munión. Says so:"Hic jacet Rodericus Munionis. Obiit VII Idus decembris, anno incarnati Verbi MCCXXVIII°. There is another tombstone that does not bear a date, but it seems to correspond to the end of the 12th century and is from a couple formed by the spouses Hiclupo and Plinia, who had to leave some goods for the work of the temple, and for their generosity they are assured of the eternal prize . Says so:"In spe nonnulla yacet Hiclupus et sua Plinia pro quibus oremus. Omnis opus istud habemus. Inde pater noster qui veruegerit istos viat vita eterna".One of the most curious tombstones is the one that is embedded in the left part of the side doorway of the temple, in the midday atrium. Says so:«Hic lacet Blasco Pérez who outlined some houses that are in Almuzara next to the houses of Xemena Saiastia and on the other side Doinus Gil Abat de San Gil; for the work of this church of San Martín and not for the clergy. Obit V. Kalendas februarii Eram CCC».

 

Texts of Saints San Cristóbal Sebastián and Esmeralda Arnáez Pérez-Argota. 

The Parish of San Martín de Segovia, "Its History and its Art".