Dear Bradley ~
The Pigot chart published in Lipscomb, History and Antiquities of County Buckingham, 1 (1847): 409 indicates that Peter Pigot, of Willaston, Shropshire, living 1282, married "Joane, dau. of Sir Fulke Fitz-Warine, Knt., of Abberbury."
Sir Fulk Fitz Warin (also known as Fulk Glas and Fulk de Layham), of Alberbury, Shropshire, occurs in 1264-1292, was a younger full brother of Fulk Fitz Warin (died 1264), of Whittington, Shropshire, who married Constance de Tony.
For further particulars regarding Sir Fulk Fitz Warin, of Alberbury, Shropshire, see Eyton, Antiquities of Shropshire 7 (1858): 79-86, available at the following weblink:
https://books.google.com/books?id=6UtNAAAAMAAJ&pg=PA79
Eyton indicates that Fulk Fitz Warin, of Alberbury, was summoned in 1292 to answer his nephew, Fulk Fitz Warin, of Whittington, Shropshire, who sought to make him keep to a convention concerning the manor of Alberbury, Shropshire, formerly made between the plaintiff's father and the defendant.
I also find that in 1290 John le Romeyn, Archbishop of York, mandated that his official make inquiry about a precious stone called "asininius" bequeathed by lady Agnes Bacun, of Edlington, Yorkshire, deceased, to her brother, Sir Fulk Fitz Warin, of Alberbury, Shropshire [Reference: Romeyn, Reg. of John le Romeyn Lord Archbishop of York 1286-1296, 1 (Surtees Soc. 123) (1913): 99-100].
Lady Agnes Bacun and her brother, Sir Fulk Fitz Warin, of Alberbury, were younger children of Fulk Fitz Warin, Knt., of Whittington and Alberbury, Shropshire, Alveston, Gloucestershire, etc., by his 1st wife, Maud le Vavasour.
Best always, Douglas Richardson, Salt Lake City, Utah