 grÃ¢ce-hollogne is a municipality of belgium. it lies in the country's walloon region and province of liege. the municipality is effectively a part of the greater liÃ¨ge conurbation, separated from liÃ¨ge city centre by the municipality of saint-nicolas. included within its boundaries is liÃ¨ge airport. on 1 january 2006 grÃ¢ce-hollogne had a total population of 21,753. the total area is 34.24&nbsp;kmÂ², which gives a population density of approximately 635 inhabitants per kmÂ². == history == grÃ¢ce-hollogne was formed by the grouping of former municipalities bierset, grÃ¢ce-berleur, hollogne-aux-pierres, horion-hozÃ©mont, and velroux, along with part of mons-lez-liÃ¨ge. the killing of four demonstrators on 30 july 1950 in grÃ¢ce-berleurdetailed recounting of the events in grace-berleur, 1950 was one of the most significant moments in the so-called royal question of 1950, which grew out of resentment towards king leopold iii and his actions in world war ii. in june 1995 it was from grÃ¢ce-hollogne that julie lejeune and mÃ©lissa russo were infamously abducted to become victims of the notorious serial killer and child molester marc dutroux.skytopic one of the municipality's schools is now named ecole julie et melissalist of provincial and communal schools in honour of the murdered girls and flowers are still left regularly on the julie & melissa monument.photo of the julie & melissa monument ==economy== avient aviation has its continental europe offices on the property of liÃ¨ge airport."welcome." avient aviation. retrieved on 8 august 2011. "with head office in harare, zimbabwe, avient has two further offices; one in continental europe and the other in the united kingdom.""contact us." ([http://www.avient.aero/content/
History_of_Wallonia Municipalities_of_LiA"ge_(province)