By Ari Rabinovitch JERUSALEM (Reuters) - After a century of searching, archaeologists say they have found the remnants of an ancient Greek fortress once a centre of power in Jerusalem and a stronghold used to hold off a Jewish rebellion celebrated in the scriptural Book of the Maccabees. Researchers have long debated over the location of the Acra, built more than 2,000 years ago by Antiochus Epiphanes, king of the Hellenised Seleucid empire. Many asserted it stood in what is now Jerusalem's walled Old City, at spots like the Church of the Holy Sepulchre or by the hilltop where two Jewish temples once towered and which now houses the Al Aqsa mosque compound.