Mykhailo Doroshenko (?–1628) was the Hetman

Hetman

Hetman was the title of the second-highest military commander in 15th- to 18th-century Poland and the Grand Duchy of Lithuania, which together, from 1569 to 1795, comprised the Polish-Lithuanian Commonwealth, or Rzeczpospolita....

 of the registered Ukrainian Cossacks from 1623–1628.

He was elevated to the rank of Cossack

Cossack

Cossacks are a group of predominantly East Slavic people who originally were members of democratic, semi-military communities in what is today Ukraine and Southern Russia inhabiting sparsely populated areas and islands in the lower Dnieper and Don basins and who played an important role in the...

 colonel

Colonel

Colonel , abbreviated Col or COL, is a military rank of a senior commissioned officer. It or a corresponding rank exists in most armies and in many air forces; the naval equivalent rank is generally "Captain". It is also used in some police forces and other paramilitary rank structures...

 in 1616, and he was active in Petro Konashevych

Petro Konashevych

Petro Konashevych-Sahaidachnyi, , was a Hetman of Registered Cossacks and the Kosh Otaman of Zaporozhian Host from 1601–1618, a brilliant military leader both on land and sea. While being a Cossack Hetman, he transformed the Cossack Host into a regular military formation and imparted a statist...

's wars against Muscovy. He personally participated in the Battle of Khotyn

Battle of Khotyn

Battle of Khotyn can refer to several battles that took place near Khotyn:* Battle of Khotyn * Battle of Khotyn...

 in 1621. Just after Doroshenko was elected hetman of the registered Cossacks, he signed the controversial Treaty of Kurukove

Treaty of Kurukove

The Treaty of Kurukove was an agreement between Hetman Stanisław Koniecpolski of the Polish-Lithuanian Commonwealth and Mykhailo Doroshenko of the Ukrainian Cossacks. After four days of negotiations, it was signed on 5 November 1625 near Lake Kurukove and what is now Kremenchuk. The treaty was a...

 with the Polish

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 crown in 1625. This led him to conflicts with the Zaporozhian Cossacks who had opposed the treaty. Doroshenko oversaw the establishment of six registered regiments.
He died on 31 May 1628, in a battle while his armies approached Bakhchisaray

Bakhchisaray

Bakhchisaray is a town in Central Crimea, centre of the Bakhchisaray raion , best known as the former capital of the Crimean Khanate...

, the capital of the Crimean Khanate

Crimean Khanate

Crimean Khanate, or Khanate of Crimea , was a state ruled by Crimean Tatars from 1441 to 1783. Its native name was . Its khans were the patrilineal descendants of Toqa Temür, the thirteenth son of Jochi and grandson of Genghis Khan...

, in support to anti-Ottoman rebellers Mehmed III Giray and Shahin Giray besieged by Ottoman

Ottoman Empire

The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

ally Qan Temir in their capital.