Answer:
Watchman system
Step-by-step explanation:
The Frankpledge system required that community members provided mutual defense, it didn't establish any formal institution or arrangement similar to police system.
In England, watchmen were instituted by a royal ordinance in 1233, and later constables and sheriffs (highest police position) were appointed by King Henry III through the Assize of Arms of 1252.
The duties of watchmen were to patrol at night (starting at 9 pm and ending at sunrise) in a similar manner that police officers patrol a city, in an effort to prevent crime and guarantee peace.