1032: Basel is the seat of the Bishopric of Basel. (1,2)

1528: The seat of the bishopric is moved to Porrentruy. (2)

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Notes

1. "Basel," en.wikipedia.org/wiki/Basel (Accessed 2011 Jul 19). Basel, CH.

2. "Prince-Bishopric of Basel," en.wikipedia.org/wiki/Bishopric_of_Basel (Accessed 2011 Jul 19). Bishopric of Basel, CH.