While the Amiga could be used with a TV in a pinch, it was primarily intended for use with an RGBA monitor; memory says, and Google seems to confirm, that was the 1084.
Commodore made color monitors previously, but the ones used with machines like the 64 and Plus/4 only had to display 40 columns; some of the later PET models did 80, but that was monochrome.
Was the 1084 the first Commodore color monitor suitable for 80-column text?