The -d- form of the verb is not well attested, though TL lists one citation from a continental version of the legend of Théophile (in Bartsch Langue et litt. 468.29 ‘tut l’obedient a paor et le tenoient a seignor’; MS. second half of 13th cent.). The use here is less likely to be an early form of obedier as an intermediate step between oboedire and obeir, than to be simply a conservative spelling reflecting the Latin source. In early Anglo-Norman (e.g. St Brendan; Oxford and Cambridge Psalters), retained intervocalic dentals are not uncommon and are generally regarded as examples of archaic scribal practice rather than as reflections of phonetic reality (see Pope, 1934, §1215; Short, 2013, §24.3). The consensus is that the sound was reduced somewhere between at earliest the 9th cent. (Straka) and at latest the 11th (Bourciez, de la Chaussée).