The Luttrell Psalter has been called ‘arguably the most famous fourteenth century illuminated manuscript.' It was commissioned by Sir Geoffrey Luttrell (1276 - 1345) the then squire of Irnham. The colourful images in the margins depict detailed scenes from daily life in a medieval village, alongside inventive mythical creatures and, most importantly, scenes from the Bible (notably the Annunciation, Birth, Baptism, Ministry, Crucifixion and Resurrection of Christ). The Psalter itself is now in the British Library, but St. Andrew’s Church has on display an excellent modern facsimile.
Sir Geoffrey Luttrell was one of the most important courtiers in the reign of King Edward III. He was also an extremely wealthy man. In his Will, he states: I leave my soul to God and the Blessed Mary and all His saints, and my body to be buried in the chancel of the church of Irnham by the high altar …... I give and bequeath for distribution to the poor on the first day of my burial, on the seventh, and on the thirteenth day, two hundred pounds sterling [approximately £160,000 in today’s money].
The British Library has a section dedicated to the Luttrell Psalter.
Wikipedia also has an article on the Luttrell Psalter.