Some time in the 1560s Korniakt settled in the city of Lwów (now Lviv, Ukraine) where he took over a business of his older brother Michael.

[11] The King of Poland Sigismund II Augustus granted him official title of nobility on 12 February 1571 as szlachcic Konstanty Korniakt, also awarded a number of other privileges, thereby establishing the Krucina coat of arms.

He became a merchant and traded in wine, cloth, cotton, honey, hides and furs and soon became very wealthy, even lending money to the kings of Poland including Sigismund II Augustus, and other noble families.

[13] He was an ardent follower of the Eastern Orthodox Church and defended its interests maintaining friendly relations with other Christian denominations.

[1] His son subsequently sold part of his estate and land in Lwów, and his brother Alexander Korniaktow left and moved to the property he inherited from his parents in Przemyśl.