No, "of all the Britannias" as Rupert says, that is (I suppose), "of England, Scotland, Wales, and Ireland".
England, Scotland, Wales, and Northern
Ireland today is called "Great
Britain." So today there is just one
Britain, which is why I asked earler on what "all the Britains" were. It sounds odd to modern ears. Yours is a reasonable conjecture.
Earlier coins refer to
England,
France and
Ireland as separate entities, so
Ireland was not always referred to as a
Britain. This is from an Elizabeth I threepence:
ELIZABETH D G ANG FR ET HIB
REGINANo Scotland then. Charles the first:
CAROLUS D G MA B FR ET H
REX So at that point I presume Great
Britain ("MA B") included
England, Scotland and Wales, but not
Ireland.
BRITANNIARUM
REX FID DEF was seen in the early 1800s. "All the Britains" seems to have arrived with the
Victoria "old
head" coins:
VICTORIA DEI
GRA BRITT
REGINA FID DEF
IND IMPPerhaps it was a convenient abbreviation to allow
IND IMP to be crammed in.