Sunday 12 April. FIRST SUNDAY AFTER EASTER.
Monday 13. Feria II.
Tuesday 14. Saints Tiburtius and Valerian [martyrs], three lessons.
Wednesday 15. Feria IV.
Thursday 16. ST MAGNUS, martyr, double.
Friday 17. Feria VI.
Saturday 18. Sabbath.
The anthem after Compline is Regina celi.
The Feast of St Magnus was presumably of higher rank (major double or even summum) in Orkney and Shetland, and evidence from, e.g., petitions for indulgences, suggest that the feast was kept with an octave at St Magnus Cathedral, Kirkwall. Quite right too.