St Edmund Arrowsmith was a Jesuit priest who was martyred in Lancaster on 28th August 1628.
The Cathedral entrance has a window depicting the saint. It includes an image of Lancaster Castle, where St Edmund was imprisonned; the castle is still in use as a prison today.
The window was paid for by an anonymous donor from Wigan. It was blessed by Rt Rev Patrick O'Donoghue, Bishop of Lancaster, on Sunday 19th May 2002, the feast of Pentecost.
The Cathedral celebrates St Edmund as one of the Lancashire Martyrs, whose feast is kept throughout the diocese on 7th August each year.