Court of Chancery
The Court of Chancery was a court of equity, which appealed to fairness. Amongst the functions of the Court of Chancery was dealing with inheritance disputes. The Trefeglwys cases I am aware of are:
Price v. Lewis 1700
Williams v. Ingram 1679
C5/96/33, C10/461/50, 482/207
If you know of any more, please get in touch so these can be included.