A psalter's origins can often be 'tracked' by the saints' names given 'red-letter' treatment in its calendar, because regions and towns commemorated their local saints. Other features of a psalter, such as types of prayers and styles or types of pictures, can connect it with a location. The Egerton Psalter, however, tells us little. Some link with Norwich is indicated by the calendar's special treatment of Felix of Dunwich, and more clues are given by another kind of evidence, later ownership. Its calendar notes deaths of members of the Holbrook and King families in the 15th and 16th centuries, as well as of William Pepyr, Vicar of Metyngham in the 14th century, supporting its early connections with East Anglia. In the Egerton Psalter, Psalm 109 / 110 has a depiction of the Trinity as the 'Gnadenstuhl' or Mercy Seat (or Throne of Grace), which emphasises the three persons as the one God of Christianity. God the Father sits behind the Son on the cross with the dove of the Holy Spirit over the cross. Two angels hold incense on either side, underscoring the idea that the three are the one God by alluding to the cherubim over the ark.