Mediator

·noun One who mediates; especially, one who interposes between parties at variance for the purpose of reconciling them; hence, an Intercessor.

mediator
mĕdĭātor, ōris, m. [medius], a mediator (post-class., esp. in eccl. Lat.): tot mediatorum praesenti...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.