Around 1414, Lacey was appointed Dean of the Chapel Royal, accompanying King Henry V to the Battle of Agincourt in 1415.[5]
He was elected to the see of Hereford between 21 January and 17 February 1417 and consecrated on 18 April 1417.[6] He was then translated to the see of Exeter on 15 July 1420.[7] While bishop at Exeter, Lacey promoted the cult of the Archangel Raphael, proclaiming the feast in his diocese in 1443, and working throughout England to institute the cult.[8]
Lacey died on 18 September 1455.[7]
His executors appear as John Cobethorn, Henry Webber, John Germyn and John Burnebyry, all church officials, in 1460;[9]
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). Handbook of British Chronology (Third revised ed.). Cambridge, UK: Cambridge University Press. ISBN0-521-56350-X.
Swanson, R. N. (1995). Religion and Devotion in Europe, c.1215–c.1515. Cambridge Medieval Textbooks. Cambridge, UK: Cambridge University Press. ISBN0-521-37950-4.