Acting hetman

Acting Hetman (Ukrainian: Наказний гетьман) was a title during the 17th, and 18th centuries, in the Cossack Hetmanate. The acting hetman was the governing authority in the Cossack Hetmanate temporarily substituted for the Hetman.

The acting hetman was appointed by the hetman himself or elected by the Council of Officers (starshyna). More than often the office was appointed by the Hetman as his deputy rather than elected by the General Military Council or the Cossack Council. His appointment could have been temporary and quickly abrupt and was caused by a necessity to command a group of forces at other portions of military front or tactical direction, similarly to the "field hetman" of Polish-Lithuanian Commonwealth.

Usually acting hetman was chosen out of the General Officer Staff and more than often it was a General Quartermaster, a leader of the staff. There were incidents when acting hetman was chosen among colonels (a regional leaders) such as Yakym Somko.

Acting hetman performed duties of the hetman when the later was absent during military campaigns, foreign travels, or his incapacitation. As well as a temporary replacement if the hetman's office became vacant, because of death, abdication, or deposition. Sometimes the appointed hetman acted as a full-pledged hetman as Filon Dzhalaliy when he was elected in 1651 and 1655 as well as Ivan Bohun when he was elected after the Battle of Berestechko (Bohdan Khmelnytsky was taken as a prisoner) or as in case of Pavlo Polubotok when he acted as hetman due to the death of such.

On a territory of the left-bank Ukraine the office often was a counteractive to the righteously elected hetman. Sometimes acting hetmans were appointed by foreign leaders such as Ivan Bezpaly was appointed acting hetman by the Muscovite voivode of Belgorod. Among such hetmans were Yakiv Somko, Ivan Bezpaly and others.

...
Wikipedia