Beautiful and unexpected piece, Pattie. Thanks for sharing. Do you have any more information about it besides the brief description on the British Museum page? CIMRM maybe?
Thinking of forming a weekly group for those in the Anglosphere(USA, Canada, UK, Australia and NZ) to have a webcam call, discuss all things related to Mithras and form friends sharing a niche interest:)
Why did the Romans worship a Persian god? This book presents a new reading of the Mithraic iconography taking into account that the cult had a prophecy.
In this 4th-century Roman altar, a certain Rufius Caecinius Sabinus defines himself as Pater of the sacred rites of the unconquered Mithras, having undergone the taurobolium.