th-

th- + art → thart

th- + other → thother

Note therfore that Czar in the Ruthens tounge signifieth a kynge, wheras in the language of the Slauons, Pollons, Bohemes, and other, the same woorde Czar, signifieth Cesar by whiche name Themperours haue byn commonly cauled.

1555, Peter Martyr d’Anghiera, translated by Richard Eden, The decades of the newe worlde or west India, London: William Powell, page 290