Mirabilia Urbis Romae

Mirabilia Urbis Romae ("Marvels of the City of Rome") is a much-copied medieval Latin text that served generations of pilgrims and tourists as a guide to the city of Rome. The original, which was written by a canon of St Peter's, dates from the 1140s. The text survives in numerous manuscripts.
"Unhampered by any very accurate knowledge of the historical continuity of the city, the unknown author has described the monuments of Rome, displaying a considerable amount of inventive faculty," the "Catholic Encyclopedia" reports. The legend-filled "Mirabilia" remained the standard guide to the city until the fifteenth century. At the time it was written, the inhabited part of Rome, the "abitato", was a small city located in the bend of the Tiber River surrounded by the ruins of the great ancient city, where within the standing walls and gates of the ancient city were fields where cattle sheep and goats grazed among the temples and baths, giving to the Roman Forum its name "Campo Vaccino" (the "cow pasture").
From the pontificate of Boniface VIII (1294–1303) to that of John XXII (1316–34) the text was revised and enlarged. Its authority was unquestioned until the 15th century, when two authors set out to supersede it with new descriptions from a fresh Renaissance point of view. One was Leon Battista Alberti's "Descriptio urbis Romae", written "ca."1433. Another was Flavio Biondo's "Roma instaurata", written in 1444 and circulated in manuscript; it was printed in 1481. 
Modern critical attention was first drawn to the different versions of "Mirabilia Urbis Romae" by the 19th-century archaeologist of Christian Rome, Giovanni Battista de Rossi, in "Roma Sotterranea" (vol I, 1864, pp 158ff). The edition of Louis Duchesne in the "Liber Censuum de l'Eglise Romaine" (I, Paris, 1905, 262-73), gave the text of the original of Cencius Camerarius with the variants of four other manuscripts. In 1889, Francis Morgan Nichols published the first English translation, which was reprinted in 1986 by Italica Press.
Contents.
The contents of the "Mirabilia" fall into the following sections, the title headings being taken from the "Liber Censuum": 