Looks as if Sir Roger was quite a renown and roguish rake that may have been at laying on of hands in more than a nunnery.
"For the love of a knyght,
Syr Roger of Donkesley,
that was her owne special"
On 13th March 1301 a Roger de Doncaster is described in a quitclaim as a chaplain with a manor at Hornington. The quitclaim was witnessed by a Robert de Pavley. Clergymen were given the title of 'Sir'. In 1306 Roger the chaplain was sent as a priest, by the Archbishop of York, to Ruddington near Nottingham. In 1309 a Roger de Doncaster ['Sir Roger De Doncastria'] was charged with adultery with Agnes, wife of Philip de Pavely. He is further mentioned as a vicar of Ruddington in 1328. By 1333 a person of the same name ['Sir Roger De Doncastria'] was imprisoned in Nottingham for tresspass of vert in Sherwood.http://midgleywebpages.com/dedonc.html
"Robin Hood: A collection of all the ancient poems, songs and ballads, now extant, relative to that celebrated English outlaw" http://www.archive.org/details/robinhoodcollect01ritsrich
Robin was reachles on a roote
And stumbled at that tyde ;
And Guy was quicke and nimble withall,
And hitt him ore the left syde.
Ah, deere ladye, sayd Robin Hood tho,
Thou art both mother and may,
I think it was never mans destinye
To dye before his day.
Robin thought on our ladye deere.
And soone leapt up againe,
And strait he came with a[n] awkwarde stroke,
And he sir Guy hath slayne.
He took sir Guys head by the hayre,
And sticked itt upon his bowes end :
" Thou hast beene a traytor all thy life,
Which thing must have an end."
Robin pulled forth an Irish knife,
And nicked sir Guy in the face,
That he was never on woman born
Cold tell whose head it was.