Owain demonstrated his new status by negotiating the "Tripartite Indenture" in February 1405 with Edmund Mortimer and Henry Percy the 1st Earl of Northumberland.
Owain demonstrerede sin nye status ved at forhandle den såkaldte "Tripartite Indenture" i februar 1405 med Edmund Mortimer og Henry Percy den 1. jarl af Northumberland.