Michał Florian Rzewuski (died 1687) was a Polish-Lithuanian nobleman and politician, Treasurer

Podskarbi

Podskarbi in Poland then in Polish-Lithuanian Commonwealth was minister responsible for the treasury. Since 1569 also a senatorial office. The title although meaning treasurer can be deconstructed as "under[King]-treasury" - treasury as an old-fashioned adjective...

 of the Crown Court.
He moved to Lviv

Lviv

Lviv is a city in western Ukraine. The city is regarded as one of the main cultural centres of today's Ukraine and historically has also been a major Polish and Jewish cultural center, as Poles and Jews were the two main ethnicities of the city until the outbreak of World War II and the following...

 in 1663 and worked there as a writer (1670–1676) and royal colonel from 1674. He was Treasurer of the Crown Court from 1684, he was also Starosta

Starosta

Starost is a title for an official or unofficial position of leadership that has been used in various contexts through most of Slavic history. It can be translated as "elder"...

 of Chelm

Chelm

Chełm is a city in eastern Poland with 67,702 inhabitants . It is located to the south-east of Lublin, north of Zamość and south of Biała Podlaska, some 25 kilometres from the border with Ukraine...

. A brave knight, he participated in almost all the battles of John II Casimir, contributed to the victory of Chocim, further distinguishing himself in the Turkish wars for Jan III Sobieski.