The signature of Ioannis Kapodistrias, politician and first governor of Greece from 1828 until his assassination in 1831.
https://commons.wikimedia.org/wiki/File:Ioannes_Capodistrias_signature.gif
Ioannis Kapodistrias (1776-1831) // Ιωάννης Καποδίστριας (1776-1831)