Facts and Events
Degory Priest (c.1579 - c.1621) was a member of the Leiden contingent on the historic 1620 voyage of the ship Mayflower. He was a hat maker from London who married Sarah, sister of Pilgrim Isaac Allerton in Leiden. He was a signatory to the Mayflower Compact in November 1620 and died less than two months later.
In some documents of the time, his name was also written as Digory Priest.
Very little is known about Degory Priest. Since he was married in Holland in 1611, it is clear that he was a religious Separatist very early on, and was an early member of the Pilgrims' Leyden congregation.
Degory was called a hatter of London. On October 4, 1611, his intention to marry was published, an d a month later, November 4, he married Sarah Vincent, of London, widow of John Vincent and s ister of Isaac Allerton, his witnesses being William Lysle and Samuel Fuller and hers Jane Diggens and Rosamund Jepson. November 1615; Admitted to city of Leyden, Holland, Isaac Allerton "guaranteeing for him" upon his admission to civic rights in that city. 
Degory was the 29th signer of the Mayflower Compact. He came alone on the Mayflower, planning to bring wife and children later after the colony was better established. His death the first winter ended those plans. His wife remarried in Leiden to Godbert Godbertson, and they had a son Samuel together shortly thereafter. Godbert, his wife Sarah, their son Samuel, and his step-children Mary and Sarah Priest all came on the ship Anne to Plymouth in 1623.
It has been suggested that Degory Priest of the Mayflower may have been the Degorius Prust, baptized 11 August 1582 in Hartland, Devon, England, the son of Peter Prust. The suggestion was made in NEHGR 111:320 in a note by John G. Hunt, who noted that the entry may also have meant that "Digorius" was the son of Hugh Prust, deceased, and his wife Agnes Wood buried at Hartland 19 Jan 1582/3.
However, given that the baptism appears to be about 3 years too late, and the fact that none of the Leiden Separatists are known to have come from Devonshire, there is good reason to doubt this baptism belongs to the Mayflower passenger. Degory Priest was one of the earliest to have arrived in Leiden, so it is more reasonable to suspect he is from the Nottinghamshire/Yorkshire region, the Sandwich/Canterbury region, the London/Middlesex region, or the Norfolk region: all of the early Separatists in Leiden appear to have come from one of these centers.
Great Migration, as a result of surveying literature as of 1995, found his parents undetermined, as did the volume of Mayflower Families through Five Generations on his descendants.