Katherine Forsyth, an expert in the history and culture of early Celtic-speaking peoples, based at the University of Glasgow, described it as an "amazing find".
As he walks into Celtic Park as the club's 17th manager in their 122-year history, he could be forgiven for feeling no little trepidation over what lies ahead.
The Swede joined Barca in 2004 following a hugely successful seven-year spell at Celtic, where he is widely hailed as one of the best players in the club's history.
And how apt that after all the water that has fallen on the Celtic Manor this weekend, that the scoreboard is awash with blue heading into the first Monday in Ryder Cup history.