^Helen J. Nicholson, The Crusades (2004) "After the First Crusade (1095–99) Pope Paschal II decided that those who fought the Muslims in the Iberian Peninsula should have their penance remitted, just as if they had gone to Jerusalem." p.26
^Douglas L. Wheeler, Walter C. Opello (2010) "In 1147, after a long, bloody siege, Muslim-occupied Lisbon fell to Afonso Henrique's army. Lisbon was the greatest prize of the 500-year war." p.7
^This is the expression consistently used in the eye-witness chronicle of the siege, De expugnatione Lyxbonensi, attributed in the sixteenth century to "Osbernus". The ms, titled "Historia Osberni" by a sixteenth-century annotator, is in the form of a letter, with a superscription "Osb. de Baldr. R salutem" that C. R. Cheney read as to "Osberto de Baldreseie" i.e. Bawdsley, Suffolk, from a certain "R."; see Cheney, C. R. (1932). “The Authorship of the De Expugnatione Lyxbonensi”. Speculum7 (3): 395–397. doi:10.2307/2846677. ISSN0038-7134. JSTOR2846677.
^The prominence of Hervey de Glanvill has suggested to some readers that Osbernus was an Anglo-Norman cleric with special attachment to him and his house.
^Osbernus, who adds "As a result the basest element from every part of the world had gathered there, like the bilge water of a ship, a breeding ground for every kind of lust and impurity."
^Paul Buck, Lisbon: a cultural and literary companion (2002) "At its base is the Martim Moniz (in tribute to the soldier who held the city gate open at the cost of his life during the siege)..." p.118
L. Wheeler, C. Opello, Douglas, Walter (2010). Historical Dictionary of Portugal. Scarecrow Press. ISBN978-0-8108-6088-9
Runciman, Steven (1952). A History of the Crusades, vol. II: The Kingdom of Jerusalem and the Frankish East, 1100–1187. New York: Cambridge University Press
Brundage, James (1962). The Crusades: A Documentary History. Milwaukee, Wisconsin: Marquette University Press
Phillips, Jonathan (2007). The Second Crusade: Extending the Frontiers of Christendom. New Haven, Connecticut: Yale University Press. ISBN978-0-300-11274-0
Villegas-Aristizábal, Lucas, "Revisiting the Anglo-Norman Crusaders' Failed Attempt to Conquer Lisbon c. 1142" Portuguese Studies 29:1 (2013), pp. 7–20.