28
. The forum for implementing Clause 12, ‘no scutage or aid shall be imposed… unless by the common counsel of our kingdom’, was explained in Clause 14, which details the composition and summoning of a representative assembly of clerical and lay magnates and all tenants-in-chief.29
. Oliver of Paderborn,30
. Waitz,31
. Burchardus Urspergensis, MGH SS, xxiii, 378–9.32
. E. Baratier, ‘Une Prédication de la croisade à Marseille en 1224’,33
. James of Vitry,34
.35
.36
. Röhricht,37
. C. T. Maier,38
. Powell,39
. Powell,40
. E.g. Tyerman,41
. James of Vitry,42
. Tyerman,43
. For Savaric in Languedoc, and a note of his other crusading exploits, PVC, p. 130 and note 12.44
. E.g. by Oliver of Paderborn,45
. Tyerman,46
. Frederick’s role is exhaustively discussed in Powell,47
. Powell,48
. James of Vitry,49
. Thomas of Split,50
. The two main sources are the51
. Oliver of Paderborn, p. 61 and pp. 53–9 for the Palestine campaigns of 1217–18. In general, also, see Röhricht,52
. Thomas of Split,