images: File:Paris_13th.png licensed with Cc-by-sa-2.5 2005-09-17T18:31:49Z Thbz 1400x1064 (1162228 Bytes) Map of the 13th arrondissement of Paris. Map created
13th-century fifth-point arch shape, according to Branner's 1960 interpretation of (Paris, Bibliothèque nationale de France, MS Fr 19093) of the 13th-century
From: William of Tyre: Histoire d'Outremer, French, 13th century, Bibliothèque Nationale, Paris, MS Fr. 9081, f.99v English determination method: SHA-1