Married to Anna Biberstein-Starowieyska, father of Andrzej Alojzy Jan Stanisław Ankwicz (archbishop of Lviv) and daughters Kordula and Krystyna.

[2] In 1784 he received the Order of the White Eagle from king of Poland, Stanisław August Poniatowski, as well as the title of count (hrabia) from Empress of Maria Theresa of Austria-Hungary; later, he also received the office of Chamberlain at the Austrian court.

In 1792 a number of Polish diplomatic missions were cancelled, and Ankwicz was recalled to Warsaw.

Known for his lavish lifestyle, poor investments and as a gambler,[3][4] he quickly fell in debts and was recruited by Russian ambassador and Jacob Sievers.

[2][5] His last actions earned him further recognition, as he gave the executioner a golden box, to commemorate the moment of the execution, and put the rope on his neck himself.