Trunck Breeches.—Barba Longa.—Mercenary Preacher

In reading Smith's *Obituary*, edited by Sir H. Ellis for the Camden Society, I find the following entries:— "1640. May 29th, old Mr Grice, in Aldersgate St, who wore *trunck* breeches, died." "1646. Ocr 1. William Young, Chandler, within Aldersgate, a discreet Juryman, and *Barba Longa*, died." "Fer 21., old Mr Lewis, the *Mercenary Preacher*, buried." Can any of your correspondents explain the meaning of "*Trunck* Breeches," "*Barba Longa*," and "*Mercenary Preacher*?"