1. Clement of Rome: He was the third bishop of Rome and is considered one of the earliest apostolic fathers. He wrote a letter to the Corinthians known as the First Epistle of Clement, which addressed issues of unity and order in the early Christian community.
2. Ignatius of Antioch: He was the bishop of Antioch and wrote several letters while being transported to Rome for martyrdom. His letters emphasized the importance of unity, obedience to bishops, and the real presence of Christ in the Eucharist.
3. Polycarp of Smyrna: He was a disciple of the apostle John and became the bishop of Smyrna. He wrote a letter to the Philippians and was known for his strong defense of orthodoxy against heretical teachings.
4. Hermas: He was a Christian slave who wrote a book called The Shepherd, which contained visions and teachings on repentance, forgiveness, and the importance of living a virtuous life.
5. Papias of Hierapolis: He was a bishop and wrote a five-volume work called Expositions of the Sayings of the Lord, which collected the teachings of the apostles and their disciples.
These are just a few examples of apostolic fathers, and there are others like Barnabas, Didache, and others who contributed to the early development of Christian theology and practice.