According to the Maniot tradition, confirmed by the May 31, 1870 epitaph of Anastasios-Petros Mavromichalis (which may be found in the Metropolis of Athens), the first members of the clan were refugees from the community of Kardias in Eastern Thrace who escaped Turkish attacks in 1452 and resettled in Western Mani.
After fortifying the village they took advantage of the port taxations during the Venetian domination which eventually arranged their land's virtual autocephaly.
Although considered a traitor to his motherland and religion Şükür was vital in lobbying for the appointment of his cousin Petros "Petrobey" Mavromichalis as the head of state of the Beylik of Mani by the Sublime Porte.
Under the leadership of Petrobey and his brother Konstantinos Mavromichalis, Greek forces successfully defeated renowned Ottoman commander Ibrahim Pasha during the Egyptian Invasion of Mani.
In response to their imprisonment, Petrobey's brother Konstantinos and son Georgios Mavromichalis assassinated Ioannis Kapodistrias.