
1) Byzantine court title 2) Byzantine medicine
Found on
https://www.crosswordclues.com/clue/actuarius

Actuarius or actarius, rendered in Greek as aktouarios (ἀκτουάριος), was the title applied to officials of varying functions in the late Roman and Byzantine empires. In the late Roman Empire, the actuarius was a fiscal official charged with the distribution of wages and provisions to the Roman military. In this capacity, the post is att...
Found on
http://en.wikipedia.org/wiki/Actuarius

A deputy of the senior clerk, who assisted the cornicularius with his duties in the tabularium legionis, and was himself assisted perhaps by several librarii. Also known as an actarius.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

senior clerk's deputy Assisted the cornicularius with his duties in the tabularium, and was himself assisted perhaps by several librarii.
Found on
https://www.encyclo.co.uk/local/20768
No exact match found.