[quote="San_Pio, post:4, topic:113485"]
Let me rephrase. Jesus originally chose 12 apostles. After Judas betrayed Jesus and killed himself, Matthias was chosen as his replacement. Then later on, Jesus called Saul Paulus, "Paul" to be an apostle.
The twelve disciples that Jesus directly chose are most generally called the twelve. The mission of the twelve is different than the mission of the Apostles. The twelve for instance will judge the twelve tribes of Israel. If, I recall correctly, Luke is the only Gospel that refers to the 'twelve apostles'. In any case, the earliest writings in the New Testament (some of the letters of Paul) use the term Apostle more broadly. Paul is called an apostle as is Barnabas. There is also a reference to a Junia who was well known among the apostles. The Greek is ambiguous, but, there are some early Church Fathers, if I recall correctly, who interpreted that as meaning she was an Apostle. Like so much of what happened in the very earliest Church (before the Gospels which were written 40 or more years after the death of Jesus), not much is really know about what the title Apostle actually meant.
It is well established that the Apostles were a limited group appointed directly in some way by Jesus and that there will be no more Apostles. The age of the Apostles is at an end having been replaced by the age of the Church.