The "Thirkleby" of his name was a hamlet in the parish of Kirby Grindalythe, Yorkshire.
[1] The first record of his work in the judicial system is in 1230, when he was appointed a clerk of the bench.
He acted as a Puisne Justice until 1249, although he spent large amounts of time on Eyre, serving as chief justice on three eyres in the south-west in 1243 and 1244.
Many of his eyre rolls have survived, including thirteen from the Eyres of 1246 to 1249, the largest number of rolls to survive from that period of time.
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