1204-1224 AD., Latin Rulers of Thessalonica, attributed to Boniface de Montferrat or Demetrius de Montferrat, Thessalonica mint, Æ Trachy, Sear 2057.

Latin Rulers of Thessalonica, attributed to Boniface de Montferrat (1204-07) or Demetrius de Montferrat by Malloy et al., Thessalonica mint, struck ca. 1204-1224 AD.,
Trachy (18-23 mm / 1,05 g), copper or billon, axes about coin alignment ↑↓ (ca. 160°),
Obv.: [IC - XC , to left and right of] Christ, bearded and nimbate wearing tunic and colobion, seated facing on backless throne, holding cross.
Rev.: St. Helena and St. Constantine standing facing, each holding sceptre, holding patriarchal cross between them, both wear stemma, divitison, collar and loros.
Sear BC 2057 (small module version) ; DOC IV p. 692 Type C Pl. LII B 26 ; CLBC (Catalogue of the Late Byzantine Coins) 11.25.2 ; Hendy type C 28.9-10 .

thanks to "Strategos" for the ID