biscophad

Old English

From bisċop +‎ -hād.

bisċophād m

bishophood, a bishop's office or state, a bishopric, episcopate
- late 9th century, translation of Bede's Ecclesiastical History
  Đās cāseres rīċes ðȳ tēoðan ġēare Gregorius sē hālga wer, sē was on lāre ⁊ on dǣde sē hēhsta, feng tō bisċophāde þǣre Rōmanisċan ċyriċan ⁊ þǣs apostolīċan seðles: ⁊ þæt heold ⁊ reahte þrēottēno ġēr ⁊ syx mōnað ⁊ tȳn dagas.
  In the tenth year of this emperor's reign, the holy man Gregorius, who was the greatest in learning and in deeds, rose to the bishophood of the Roman church and the apostolic see; and he held and led that office for thirteen years, six months, and ten days.

Strong u-stem:

Joseph Bosworth and T. Northcote Toller (1898) “bisceophád”, in An Anglo-Saxon Dictionary‎^[1], 2nd edition, Oxford: Oxford University Press.