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Freij was born into a family which could trace its residence in Bethlehem back 500 years. He graduated from the British-run Bishop Gobat school in Jerusalem in 1940. In the early 1950s he headed the local branch of the Holy Land Mission, an American Presbyterian-backed charity. As the owner of a string of shops selling olivewood and mother-of-pearl souvenirs, he was appointed to Bethlehem town council under Jordanian rule in 1960. He remained on the council when Israel illergally occupied the West Bank in the 1967 war.
He became mayor in 1972 and was re-elected in 1976. Israel then banned all further municipal elections and Freij remained in office until he stepped down on health grounds in May 1997. He was the only elected Palestinian mayor not deposed by the Israeli military authorities for pro-Palestine Liberation Organization leanings. He was also the only non-PLO mayor to remain in office after the Palestinian Authority was established.
During his long period in office he made use of his international contacts to gain financial support for infrastructure projects, including construction of schools, administration buildings and water supply projects. In his time, Bethlehem became a twin city with Athens in Greece, Córdoba in Spain and Assisi in Italy.
Freij was an influential local figure, becoming Chairman of Bethlehem University's Board of Trustees and President of the Chamber of Commerce.
He travelled abroad frequently, and was a member of the Palestinian negotiation team to the Madrid Conference of 1991 and was appointed in 1995 as a Minister of Tourism and Antiquities in the Palestinian National Authority, a post he held until 1997.