ABSTRACT
This chapter focuses on the importance of two manuscripts, ‘Liber Horn’ and ‘Liber Custumarum’, since they provide the much sought-after evidence for discovering the main centre of activity for the Queen Mary Group, and serve to affirm the chronology formulated for the central workshop. ‘Liber Custumarum’ can be dated with certainty to 1321 or after on account of a list of City of London officials recorded there to that year. There are no grounds for suggesting that there was more than one campaign of writing since the script of the dated portion is uniform with the remaining text. ‘Liber Horn’ is the only surviving manuscript of the Horn bequest to have remained throughout its life in the safe-keeping of the City Corporation. In structure it is a far more complex volume than ‘Liber Custumarum’ and it has warranted a detailed codicological and palaeographical examination.
