The original debt was owed by Montfort to Peter of Dreux, Count of Brittany, but was transferred by Peter to Thomas of Savoy: Maddicott,
Simon de Montfort
, pp. 24–5;
CR, 1237–42
, pp. 234–5;
CLR, 1226–40
, p. 472; Howell,
Eleanor of Provence
, p. 28; Bémont,
Simon de Montfort
, pp. 333–4 no. xxxiv.