Hendrowahyono was born in present-day
Yogyakarta. His father, Ronosentiko, was a
Yogyakarta palace soldier, serving the Mentrijero brigade at the time. His mother was Dalikem and she was a housewife and market stall owner. Hendrowahyono was the second child of the family and one older brother and nine other siblings. Owing to his father's prestigious position in that era, Hendrowahyono was able to attend school in the Dutch East Indies. He first attended Tweede Inlandsche School in Kampung Gading. Later on, he entered a teaching college in
Muntilan, where he was introduced to
Catholicism by the school's founder, Romo (Father)
van Lith. He was
baptized in 1913 and received his Christian name Ignatius Joseph. He moved to
Buitenzorg (now Bogor) in 1918 to continue his studies at Middelbare Landbouw School. == Pre-1945 Indonesian independence ==