Kirsch, Johann Peter. "Pope St. Mark." The Catholic Encyclopedia. Vol. 9. New York: Robert Appleton Company, 1910. http://www.newadvent.org/cathen/09674a.htm. Accessed 2 Jul 2014.
Pope St. Mark
The "Liber Pontificalis" remarks further of Marcus: "Et constitutum de omni ecclesia ordinavit"; but we do notknow which constitution this refers to. The building of two basilicas is attributed to this pope by the author of the "Liber Pontificalis". One of these was built within the city in the region "juxta Pallacinis"; it is the presentchurch of San Marco, which however received its present external shape by later alterations. It is mentioned in the fifth century as a Roman title church, so that its foundation may without difficulty be attributed to St. Mark. The other was outside the city; it was a cemetery church, which the pope got built over the Catacomb ofBalbina, between the Via Appia and the Via Ardeatina (cf. de Rossi, "Roma sotterranea", III, 8-13; "Bullettino di arch. crist.", 1867, 1 sqq.; Wilpert, "Topographische Studien uber die christlichen Monumente der Appia und der Ardeatina", in "Rom. Quartalschrift", 1901, 32-49). The pope obtained from Emperor Constantine gifts of land and liturgical furniture for both basilicas. Mark was buried in the Catacomb of Balbina, where he had built the cemetery church. His grave is expressly mentioned there by the itineraries of the seventh century (de Rossi, "Roma sotterranea", I, 180-1). The feast of the deceased pope was given on 7 Oct. in the old Romancalendar of feasts, which was inserted in the "Martyrologium Hieronymianum"; it is still kept on the same date. In an ancient manuscript a laudatory poem is preserved (unfortunately in a mutilated text), which Pope Damasus had composed on a Saint Marcus (de Rossi, "Inscriptiones christ. urbis Romae.", II, 108; Ihm, "Damasi epigrammata", Leipzig, 1895, 17, no. 11). De Rossi refers this to Pope Mark, but Duchesne (loc. cit., 204), is unable to accept this view. Since the contents of the poem are of an entirely general nature, without any particularly characteristic feature from the life of Pope Mark, the question is not of great importance.
Liber Pontif., ed. DUCHESNE, I, 202-4; URBAIN, Ein Martyrologium der christl. Gemeinde zu Rom am Anfang des V. Jahrh. (Leipzig, 1901), 198; LANGEN, Gesch. der rom. Kirche, I, 423.