Marcus, Hieromonichus said by Oudin to have been a monk of the convent of St. Saba, near Jerusalem, flourished in the opening of the 11th century. He wrote Σύνταγμα εἰς τὰ ἀπορούμενα τοῦ τυπικοῦ, De .Dubiis quae ex Typico oriuntur, contained in the Typicum, or ritual directory of the Greek Church (Τυπικὸνσὺν θεῷ ἀγίῳ παρεῖχον πᾶσαν την διάταξιν τῆς ἐκκλεσιαστικῆς ἀκολουθίας τοῦ χρόνου ὅλου, Typicum, favents Deo, continens integrum Officii Ecclesiastici Ordinem per totum Annum). See a description of the work in Cave, Hist. Litt. vol. ii; Dissert. 2:38. This commentary is adapted to the arrangement of the Typicum., ascribed to St. Saba, but which Oudin supposes to have been drawn by Marcus himself, and produced by him as the work of St. Saba, in order to obtain for it an authority which, had it appeared in his own name, it would not have secured. A Life of Gregory of Agrigentum is supposed to be by the same author as the Typicum. See Cave, Hist. Litt. vol. ii; Dissert. 1:13; Oudin, De Scriptorib. Eccles. ii, col. 584, etc.; Fabricius, Bibl. Graec. 10:232, 678; Smith, Dict. of Biog. and Mythol. s.v.