1) Chairperson 
A prolocutor is a chairman of some ecclesiastical assemblies in Anglicanism. In the Church of England, the prolocutor is chairman of the lower house of the Convocations of Canterbury and York. He presides in that house and acts as representative and spokesman in the upper house. He is elected by the lower house, subject to the approval of the metr...
spokesman; speaker of the House of Lords
• (n.) One who speaks for another. • (n.) The presiding officer of a convocation.
Prol`o·cu'tor noun [ Latin , from proloqui , past participle prolocutus , to speak out; pro for + loqui to speak.] 1. One who speaks for another. Jeffrey. 2. The presiding officer of a convocation. Macaulay. 
prolocutor 1. Someone who speaks for another person. 2. The chairperson of the lower house of a convocation. 3. A presiding officer or chairperson, especially of the lower house of a convocation in the Anglican Church.
a presiding officer of an assembly; chairperson. · the chairperson of the lower house of a convocation.