casere

Etymology
, alteration of earlier, from , from , from. .

Noun

 * 1)  An emperor of Rome or the Holy Roman Empire

Etymology
From, from. The original form must have been (attested in the East Anglian royal genealogy and the Rituale Ecclesiae Dunelmensis, and, as cāsaer, in the Liber Vitae Dunelmensis), which is why "empress" is  and not *cāsestre. The final -e was added later by analogy with the suffix.

Noun

 * 1) emperor