Almost as much remains of Nostell as it does of Merton; Merton is covered by a big supermarket, and Nostell by a big Georgian stately home - both signalling the change from religion to consumerism. Nostell was, like Merton, one of the big founding priories, sending canons all over the place to establish other Austin houses. Nostell grew from a hermitage in St Oswald's Wood, near Pontefract, becoming an Austin house by 1120. It was patronised by the de Lacy lords of Pontefract, and then Henry I; his archbishop of York, Thurstan, was quite possibly responsible for turning it into an Austin priory. (The Borthwick Institute says J. A. Frost's useful booklet on Nostell is out of print; you can find the first 9 pages here.) Nostell soon grew to be one of the top three northern Austin priories.
Left is the priory seal from the early 12th century. It shows St Oswald, with a crown which looks unfortunately like a jester's hat. He is seated on a throne with nice wolf-head ends, and he holds an orb and sceptre. The legend: SIGILLVM [SCI] OSWALD' REGIS & M DE NOSTELT
Oswald was a 7th-century king of Northumbria who promoted Christianity. He gave Aidan, the 'Apostle of Northumbria', Lindisfarne as the centre of his bishopric. Oswald he was killed in battle with the Mercians, and his body cut into pieces and put on spikes. Miracles of course occurred where he died. Oswald's head was buried in Durham Cathedral (although several rival heads exist elsewhere), and one of his arms turned up at Peterborough, where monks would guard it continuously to stop relic-theft. In the feretory at Durham, you can see a late-medieval statue of St Cuthbert holding St Oswald's head.
The counterseal, from later in the century, shows the BVM and Child on her lap. She holds, as Charles Clay said, 'an object in either hand'. It's difficult to make out those objects, but the right-hand one will be a sceptre, because it usually is. The legend is + CONTRASIGILL' SANCTI OSWALDI DE NOSTLE:
A further, 13th-century, seal exists (in the National Archives), possibly the privy seal or ad causas; I don't have a picture, but Clay's description is: Round, 1 in. The Virgin and Child, half-length, between four large pointed leaves. * MARIA MA…….ENA.
Prior Robert de Quixley (1393-1427), who had the history of the Priory compiled (the legend of the Priory, anyway), had a nice seal (left). It has two tiers. In the upper, St Oswald, seated on a throne, holds a sceptre between two clergy with croziers. Below, Robert himself, vested for mass, stands between two canons. The legend has a couplet feel about it, but it's very incomplete. …RO…[?RI]ORIS [?SCI]…RE[?GIS MAR]T….T…
Two more prior's seals are described by Clay:
1) John de Huddersfield (c.1427): oval, 'on the breast of a splayed eagle a shield with some floral device, flattened by pressure. ...ERhO...
2) a 15th-century prior: pointed oval, 'beneath an elaborately pinnacled and buttressed canopy a seated figure of St. Oswald the King, robed, holding two sceptres; in base, beneath a four-centred arch, a praying canon; on either side of the arch a shield of arms, dexter, a fess between [?] three lions rampant; sinister, much rubbed; legend broken away.