Noun
A rich brocade; baudekin.
A structure in form of a canopy, sometimes supported by columns, and sometimes suspended from the roof or projecting from the wall; generally placed over an altar; as, the baldachin in St. Peter's.
A portable canopy borne over shrines, etc., in procession.
Source: Webster's dictionaryIn 1629, and before St. Peter's Baldachin was complete, Urban VIII put him in charge of all the ongoing architectural works at St Peter's. Source: Internet