The pilgrimage began with a relic likely Duke Otto V .
A relic is a crucifix which had been handed over to Emperor Louis IV by Antipope Nicholas V and which was later donated to the church by one of the emperor 's sons .
The pilgrimage began with a relic , a crucifix which had been handed over to Emperor Louis IV by Antipope Nicholas V and which was later donated to the church by one of the emperor 's sons , likely Duke Otto V .