Today is the eighth anniversary of my becoming an Officer of Arms in Ordinary - when I was promoted from Linlithgow Pursuivant Extraordinary to Unicorn.
The Leap Day appeared in the Calendar following the revisions Pope Gregory XIII Boncompagni.
Here is a painting of the Pope with the Zodiac at the rear, in the Archives of Siena from 1582:
The coats of arms in the foreground are those of Trecerchi, Savini, Ugurgieri, Bronconi, Turamini, Spennazzi, Cerretani, De Vecchi, Rocchi, Bocciardi.