Biography
There are multiple artists with this name:
1) Osgiliath was a medieval black metal band from Saint-Etienne, France, formed in 1993. They released two demos, "Ainulindalë" in 1996, and "L'ombre du passé" in 1997.
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2) Osgiliath is a black metal from Mexico City, Mexico, formed in 2011. They released their first demo titled "With Sadness Sheated in Flesh" in 2012.
Biography text from Last.fm, available under CC BY-SA.