SYON, Middlesex, Bridgettine abbey of St Saviour, St Mary the Virgin, and St Bridget
The Registrum of the library of the brethren, compiled by Br Thomas Betson c. 1500 and continued to c. 1524, is in Cambridge, Corpus Christi College, MS 141; donors, second folios, and pressmarks listed; many printed books. Edited by V. A. Gillespie, Syon Abbey, CBMLC 9 (2001), SS1. Entries for deaccessioned books recovered either under erasure or from Betson's index, printed by Gillespie as SS2.
The pressmark, which survives only in three manuscripts, was written in red on a label under horn on the outside of the end cover. Another label on the end cover bore the title, donor's name, and secundo folio.