What is "hermaeus"

Hermaeus Soter ( Greek: ; epithet means "the Saviour") was a Western Indo-Greek king of the Eucratid Dynasty, who ruled the territory of Paropamisade in the Hindu-Kush region, with his capital in Alexandria of the Caucasus (near today's Kabul, Afghanistan). Bopearachchi dates Hermaeus to c. 90–70 BCE and R. C. Senior to c. 95–80 BCE but concedes that Bopearachchi's later date could be correct.