John II Comnenus (1118-1143 AD).
AE Half Tetarteron (19mm 2.99g)
Obv: Nimbate Christ standing facing on footstool, wearing pallium and colobium and holding book of Gospels; IC - XC across upper fields
Rev: Iω ΔЄCΠOT (or similar - mostly illegible), John standing facing, wearing crown, divitsion and loros, and holding cruciform scepter and globus cruciger.