The following comes from the Victoria Country History of Lancaster and ends by giving (found after six months of looking!) the arms of Samlesbury:

Manor
SAMLESBURY was held in the latter half of the 12th century by Gospatric son of Swain in thegnage by the yearly service of 12s. It is by no means improbable that he was a younger son of Swain son of Leofwin, lord of part of Hindley about the middle of the 12th century. In addition to his manor of Samlesbury he held half the manor of Alston in Amounderness, and in Salford Hundred half the manors of Harwood (fn. 4) and Sharples, estates which his son Roger held in 1212 after Gospatric's death. (fn. 5) Roger, having married Margaret daughter and heir of Walter son of Osbert (de Clifton) without the consent of the chief lord, Theobald Walter, was summoned in 1194 to answer for this default. (fn. 6) In 1224 his neighbour Edward de Brockholes demanded half the vill of Samlesbury from him, but after Roger's death accepted 10 marks from Roger's successor in 1227 to resign his claim. (fn. 7)
This successor was William de Samlesbury, Roger's eldest son, (fn. 8) who increased his estates by marrying Avina daughter and heir of William de Notton, lord of Breightmet in the parish of Bolton-le-Moors, (fn. 9) by whom he had issue Margery, Cecily and Elizabeth. He died about 1256, his widow obtaining the manor of Breightmet in satisfaction of her dower. (fn. 10) His eldest daughter Margery married first in or before 1257 Richard son and heir-apparent of William de Clifton, (fn. 11) who died shortly after his marriage, and secondly Robert de Hampton of Allonby, co. Cumb., and died without issue before July 1267 (fn. 12) ; Cecily the second daughter married before 13 April 1259 John Deuyas; and Elizabeth married after that date Robert de Holand son and heir of Thurstan de Holand. Robert de Hampton died in 1277, (fn. 13) but not until 1292 or 1296 was a partition of his third part of the manor made between Deuyas and Holand. (fn. 14) In 1311, at the death of the Earl of Lincoln, Dame Cecily Deuyas and Dame Elizabeth de Holand held a plough-land here in thegnage by the yearly service of 12s. (fn. 15)
The Holand (fn. 16) moiety of the manor passed like the other estates of the family to the Lovels, and was forfeited by Francis Viscount Lovel upon his attainder in 1485. On 25 February 1489 it was granted with many other forfeited estates in the county to Thomas Earl of Derby. (fn. 17) In July 1600 William Earl of Derby passed half the manor by fine to trustees, (fn. 18) by whom it was conveyed to Thomas Walmsley, kt., (fn. 19) Justice of the Common Pleas, and from him descended with the other estates of that family, as described in the account of Dunkenhalgh, (fn. 20) until in 1852 it was left to the father of the present owner, Mr. Oswald Henry Petre.

[Illustrated]
Lovel. Barry wavy or and gules.

[Illustrated]
Stanley. Argent on a bend azure three stags' heads caboshed or.

The D'ewias or Deuyas family became possessed of lands in Yorkshire, mostly within the Lacy fee, by the marriage of Nicholas Deuyas, kt., to Alice daughter of Jordan Foliot. (fn. 21) John Deuyas, the issue of this marriage, increased the family estate by his marriage to Cecily de Samlesbury. He was one of the knights of the shire returned for the county to the Parliaments of 1295 and 1298, having received knighthood before 1284. (fn. 22) He died before the end of 1309, (fn. 23) leaving numerous issue besides Nicholas his successor, (fn. 24) who appears to have held aloof from the rebellion of Thomas of Lancaster. Nicholas Deuyas was summoned in 1324 to attend the Great Council at Westminster. (fn. 25) Early in 1326 he settled his estates here and in Riseholme, co. Lincoln, upon his daughter and heir Alice and her issue by Gilbert son and heir of Gilbert de Southworth, to whom he had then recently given her in marriage. (fn. 26) About All Saints' Day 1335 he leased the manor-house, 169 acres of land, 11 acres of meadow with the mills to his son-in-law for a term of eight years for £11 9s. yearly, (fn. 27) and died before 15 May following, when dower was assigned to Joan his widow in half the manor, including the chief messuage which William Deuyas had lately held, and in Mellor. (fn. 28)
Some account of the early members of the Southworth family has been given in the history of the township from which they took name. (fn. 29) Gilbert de Southworth the elder acquired a number of small estates in Middleton and the hamlet of Houghton in the time of Edward I and Edward II, and Gilbert his son added to these in the next reign. (fn. 30) The elder Gilbert was sheriff from July 1323 to 12 March 1326 (fn. 31) and died shortly after, his son making arrangements with Cecily his mother in 1329 for the payment of his father's debts and provision for his brothers and sisters. (fn. 32) He was living in 1346, but was shortly after succeeded by his second but eldest surviving son Thomas, who was described as 'chivaler' in 1362. (fn. 33) John son of Sir Thomas married in or before 1386 Margaret daughter of Richard de Hoghton, kt., (fn. 34) and shortly after succeeded to his father's estates. In 1398 he was retained as 'esquire' to serve the Duke of Lancaster for life at a fee of £10 per annum and went to France in the duke's retinue. (fn. 35)
John Southworth, 'chivaler,' was one of the 2,000 Englishmen who fell victims to dysentery at the siege of Harfleur in the autumn of 1415. Thomas his son, who succeeded at the age of twenty-three, (fn. 36) married Joan daughter of John Booth of Barton in 1409, and in 1420 had licence for his oratories in the manorhouses of Southworth and Samlesbury. (fn. 37) He died in 1432, leaving issue Richard his son and heir, aged twelve years, who had been married in 1429 to Elizabeth daughter of Richard Molyneux, kt. (fn. 38) He was returned in 1444–5 with William Lord Lovel as holding Samlesbury in socage. (fn. 39) In 1462 he made a settlement of his estates and died in 1472, when it was found that Christopher was his son and heir, aged thirty years. (fn. 40)

[Illustrated]
Southworth of Samlesbury. Quarterly: 1 and 4, argent a cheveron between three crosslets sable, for Southworth; 2 and 3, sable a cheveron between three crosslets argent, for Samlesbury.

[See EYC, III, pp. 216-225 for various Foliot charters.]
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Note that in the above VCN article on Samlesbury it says:

“William de Samlesbury, Roger's eldest son, (fn. 8) who increased his estates by marrying Avina daughter and heir of William de Notton, lord of Breightmet in the parish of Bolton-le-Moors”

Unfortunately this is not wholly true.  The VCH Lancs entries for Brightmeit and Barton, the properties of her mother Cecily, who was indeed sole heir of them, these entries make it clear that Cecily had a son Gilbert who was heir of her mother who was his grandmother, Edith de Barton, which Gilbert had a son John and whose male-line offspring survived in that area for several generations.  The confusion by the VCH writer of the Samlesbury article may have been caused by the fact that Gilbert, on being declared heir of Barton, fairly promptly assumed his grandmother’s surname and became Gilbert de Barton, likewise his offspring.  This left Avina as the only child of Cecily who had probably retained, until marriage, the surname of Notton, thus leading to the assumption that she was an heiress.  Pity, as it had seemed that there were several quarters to be had.

A footnote on p. 74 of the 1533 and 1567 visitations of Lancs, pub Chetham Soc, speculates that the arms of Samlesbury might be ‘A bend between six feathers three and three [no tinctures]’ but there is no certainty as to the lineage of these arms.

The same volume does confirm, p. 17, that Robert Holland who died in 1373, held the manor of Samlesbury, though not saying how it had come into his possession.

The following volumes may show something:

(a) in the SoG Library:
SALMESBURY (St. Mary & St. John Southworth RC Church) : MIs [Microfiche]
Published : Lancashire Family History & Heraldry Society, 1991
Author Smyth, Jane (trans.)
Acc. no. 68495
Location Apply to library staff Shelf mark LA/MI/68495/1

Samlesbury : a short history
Published Preston Carnegie Press 1985
Author Hodge, Alistair C
Acc. no. 116840 Source D: M Gandy.
Location Lancashire tracts box Shelf mark Lancashire tracts box

(b) In the Chetham Society Library:
A history of Samlesbury in the hundred of Blackburn, county of Lancaster. /
Author: Eaton, Robert.
Imprint: Blackburn (England) : J. Dickinson & sons, 1936.
Location: BOOKS MAIN --Call No: 9.J.4.23

Sable a chevron between three crosslets argent

VCH Lancaster, Samlesbury article, Vol 6, pp. 303-313

Vis’n of Lancs 1664-5, Southworth pedigree, Part 3, p. 277