Stephen de Pencester was Warden of the Cinque Ports

Cinque Ports

The Confederation of Cinque Ports is a historic series of coastal towns in Kent and Sussex. It was originally formed for military and trade purposes, but is now entirely ceremonial. It lies at the eastern end of the English Channel, where the crossing to the continent is narrowest...

 when the first authoritative list of Cinque Ports Confederation Members was produced in 1293.

Stephen de Penecestre was Lord Warden of the Cinque Ports

Cinque Ports

The Confederation of Cinque Ports is a historic series of coastal towns in Kent and Sussex. It was originally formed for military and trade purposes, but is now entirely ceremonial. It lies at the eastern end of the English Channel, where the crossing to the continent is narrowest...

 for 32 years, his tenure finishing in 1299 when the Baron de Burghersh was elected; it is reasonable to assume he began his administration in 1267.