How were seneschals used in the provinces conquered by Philip II Augustus?

In the provinces conquered by Philip II Augustus, particularly in the west and south, the king instituted seneschals to serve as administrative officers with recognized territorial jurisdiction from the start.12

These officials functioned similarly to the royal baillis (bailiffs) who operated within the royal domain. Their primary responsibilities included:

• Supervising the conduct of local prévôts (provosts).31
• Administering justice in the king's name.31
• Collecting royal revenues from the domain.31
• Calling up armed forces when necessary.31

To ensure the loyal operation of these provincial institutions, Philip typically appointed men from his own court, often natives of the Île-de-France, to these positions. This approach allowed him to maintain control while retaining the deep-rooted customs and existing administrative structures of the newly acquired territories.12