The Early Church
From the time of the early Church, bishops were recognized as men who had the presence of the Holy Spirit within them. The Bishop presided over Sunday Eucharist, preached, and forgave sins. Bishops also helped maintain the unity of the Church by gathering at episcopal synods which are meetings that the bishops have to advise each other and the Pope on the current state of the Church.
Second Vatican Council
The Second Vatican Council reemphasized the bishop’s role as teacher and pastor confirmed through the fullness of the Sacrament of Holy Orders. Each Bishop is also a member of the college of bishops. The college shares with the pope authority over the whole church which is often referred to as the doctrine of episcopal collegiality .