Q >The "Chair" serves the Master.

The word "see" is derived from Latin sedes, which in its original or proper sense denotes the seat or chair that, in the case of a bishop, is the earliest symbol of the bishop's authority.[7]

This symbolic chair is also known as the bishop's cathedra,

and is placed in the diocese principal church, which for that reason is called the bishop's cathedral, from Latin ecclesia cathedralis, meaning the church of the cathedra. The word "throne" is also used, especially in the Eastern Orthodox Church, both for the seat and for the area of ecclesiastical jurisdiction.[8]

sauce: https:// en.wikipedia.org/wiki/Episcopal_see

The Holy See =

The Holy See (Italian: Santa Sede; Latin: Sancta Sedes; Ecclesiastical Latin: [ˈsaŋkta ˈsedes]), also referred to as the See of Rome, is the ecclesiastical jurisdiction of the Catholic Church in Rome,

the episcopal see of the Pope,

and an independent sovereign entity. It serves as the central point of reference for the Catholic Church everywhere and the focal point of communion due to its position as the pre-eminent episcopal see of the universal church. Today, it is responsible for the governance of all Catholics, organised in their Particular Churches, Patriarchates and religious institutes.

sauce: https:// en.wikipedia.org/wiki/Holy_See