Zürich's Grossmünster is a Romanesque and Gothic cathedral with a fascinating history involving both Catholic saints and Protestant preaching. According to legend, the Grossmünster was founded by Charlemagne after his horse bowed down on the spot marking the graves of three early Christian martyrs.

In the 3rd century, Felix and Regula were members of an all-Christian Roman legion that was to be executed en masse in southwest Switzerland. They fled with their servant Exuperantius and got as far as Zürich before being tried and executed in 286 AD.

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