Warrantia Custodiæ
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
An old English writ, which lay for him who was challenged to be a ward to another, in respect to land said to be holden by knight-service; which land, when it was bought by the ancestors of the ward, was warranted free from such thraldom. The writ lay against the warrantor and his heirs.
Cowell.