A solicitor, strictly speaking, is an assistant to a procurator, doing the mechanical work of preparing documents.
en.wikipedia.org They were called vestrymen, churchwardens, procurators (procuratores), mambours (mamburni), luminiers, gagers, provisores, vitrici, operarii, altirmanni etc.
en.wikipedia.org This was made possible when he augmented the role of procurators so that they had magisterial power.
en.wikipedia.org The "syndici" consequently replaced the "nuntii" and procurators.
en.wikipedia.org The judges first questioned accused and witnesses, then the procurator and defense counsel to corroborate the evidence in the indictment.
en.wikipedia.org