Sheptytsky was born on 17 November 1869 in the village of Prylbychi, near Lviv in Galicia to an old Polish-Ruthenian noble family.
The Szeptycki family lived in the eastern part of Poland, near Zamosc, in Labunie's Palace.
At that time, the area was of the Austro-Hungarian Empire.
 He was a younger brother of the future Servant of God,  Metropolitan Bishop Andrey Sheptytsky, and received his education first at home and starting in 1882 at Krakow.
 Sheptytsky later also studied in Munich and Paris.
In 1892 he became a doctor of law at the Jagiellonian University.
After finishing his studies he returned home to manage the family estates and look after his aging parents.
In 1900 Casimir Sheptytsky was elected to the Austrian parliament however after its dissolution in 1907 he decided to withdraw from politics.

In 1911 Sheptytsky decided to become a monk and entered the Benedictine (Latin Rite) Beuron Archabbey (Baden-Württemberg), Germany.
After a year he decided to follow the example of his older brother, returning to the Ukrainian Greek Catholic Church of their ancestors and entered the St. Theodore the Studite Monastery of St. Theodore in Bosnia.
He took the religious name of Clement, after Pope Saint Clement I, martyred in Chersonesos, who together with St Andrew the First-Called is considered to be the founder of Christianity in the Balkans.
In 1913 he undertook theological studies in Innsbruck and on 28 August 1915 he was ordained a priest by the Bishop of Križevci, Croatia Dionisije Njaradi, while studied.
After finishing them in 1919 returned to Ukraine to settle in the Holy Dormition Lavra in Peremyshliany Raion.

In 1926 Father Clement was named the hegumen (prior) of the Univ Lavra.
In 1937 he came to Lviv to aide his ailing brother Andrew.
In 1939 the region was occupied by communists, the Soviet "liberators" immediately implemented a plan to eliminate the Ukrainian intellectual elites and Church.
At the time they did not arrest the Metropolitan himself, fearing his great authority among the nation, but went after his family attempting to capture Clement and murdering their brother Leon along with his family.
During that time the Metropolitan divided the Soviet union into four exarchates and named Father Clement the exarch of Russia.
Sheptytsky was born on 17 November 1869 in the village of Prylbychi, near Lviv in Galicia to an old Polish-Ruthenian noble family. The Szeptycki family lived in the eastern part of Poland, near Zamosc, in Labunie's Palace. At that time, the area was of the Austro-Hungarian Empire.  He was a younger brother of the future Servant of God,  Metropolitan Bishop Andrey Sheptytsky, and received his education first at home and starting in 1882 at Krakow.  Sheptytsky later also studied in Munich and Paris. In 1892 he became a doctor of law at the Jagiellonian University. After finishing his studies he returned home to manage the family estates and look after his aging parents. In 1900 Casimir Sheptytsky was elected to the Austrian parliament however after its dissolution in 1907 he decided to withdraw from politics.
In 1911 Sheptytsky decided to become a monk and entered the Benedictine (Latin Rite) Beuron Archabbey (Baden-Württemberg), Germany. After a year he decided to follow the example of his older brother, returning to the Ukrainian Greek Catholic Church of their ancestors and entered the St. Theodore the Studite Monastery of St. Theodore in Bosnia. He took the religious name of Clement, after Pope Saint Clement I, martyred in Chersonesos, who together with St Andrew the First-Called is considered to be the founder of Christianity in the Balkans. In 1913 he undertook theological studies in Innsbruck and on 28 August 1915 he was ordained a priest by the Bishop of Križevci, Croatia Dionisije Njaradi, while studied. After finishing them in 1919 returned to Ukraine to settle in the Holy Dormition Lavra in Peremyshliany Raion.
In 1926 Father Clement was named the hegumen (prior) of the Univ Lavra. In 1937 he came to Lviv to aide his ailing brother Andrew. In 1939 the region was occupied by communists, the Soviet "liberators" immediately implemented a plan to eliminate the Ukrainian intellectual elites and Church. At the time they did not arrest the Metropolitan himself, fearing his great authority among the nation, but went after his family attempting to capture Clement and murdering their brother Leon along with his family. During that time the Metropolitan divided the Soviet union into four exarchates and named Father Clement the exarch of Russia.
Klymentiy Sheptytsky