Key cross (Period)

The “key cross” is found in the arms of the city of Pisa, and is sometimes called a “cross of Pisa” for that reason.  It was certainly in use by the mid-15^th Century [Triv 7], and may have been used as early as the 13^th Century.

Ian Bruce MacRae bears:  Gyronny azure and gules, a key cross Or.

Cernach Mac Gilla Críst bears:  Per pale azure and Or, three key crosses counterchanged.

Gregory de Munemuth bears:  Vert, a key cross argent.