Holy Apostle James (Iakovos), the Brother of God (Adelphotheos) was the son of Righteous Joseph the Betrothed of the Most Holy Theotokos (December 26). From his early years James was a Nazarene, a man especially dedicated to God. The Nazarenes vowed to preserve their virginity, to abstain from wine, to refrain from eating meat, and not to cut their hair. The vow of the Nazarenes symbolized a life of holiness and purity, commanded formerly by the Lord for all Israel. When the Savior began to teach the nation about the Kingdom of God, St James believed in Christ and became His apostle. He was chosen as the first Bishop of Jerusalem.
St James presided over the Council of Jerusalem and his word was decisive (Acts 15). In his thirty years as bishop, St James converted many of the Jews to Christianity. Annoyed by this, the Pharisees and the Scribes plotted together to kill St James. They led the saint up on the pinnacle of the Jerusalem Temple and asked what he thought of Jesus. The holy Apostle began to bear witness that Christ is the Messiah, which was not the response the Pharisees were expecting. Greatly angered, the Jewish teachers threw him off the roof. The saint did not die immediately, but gathering his final strength, he prayed to the Lord for his enemies while they were stoning him. St James’ martyrdom occurred about 63 A.D.
The holy Apostle James composed a Divine Liturgy, which formed the basis of the Liturgies of Sts Basil the Great and John Chrysostom. The Church has preserved an Epistle of St James, one of the books of the New Testament.
In 1853, Patriarch Hierotheus of Alexandria sent to Moscow a portion of the relics of St James. The Church distinguishes between the holy Apostle James the Brother of God, and St James the son of Zebedee (April 30) and St James the son of Alphaeus (October 9).
Troparion — Tone 4
As the Lord’s disciple you received the Gospel, O righteous James; / as a martyr you have unfailing courage; / as God’s brother, you have boldness; / as a hierarch, you have the power to intercede. / Pray to Christ God that our souls may be saved.
Kontakion — Tone 4
When God the Word, the Only-begotten of the Father, / came to live among us in these last days, / He declared you, venerable James, to be the first shepherd and teacher of Jerusalem / and a faithful steward of the spiritual Mysteries. / Therefore, we all honor you, O Apostle.
~Taken from the website of the Orthodox Church in America (OCA), http://oca.org/saints/troparia/2014/10/23/103039-apostle-james-the-brother-of-the-lord