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How did Christianity spread to Armenia, Ethiopia, India, and Central Asia?

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Mosaic: Christianity — Christianity Christ as Ruler, with the Apostles and Evangelists (represented by the beasts). The female figures are believed to be either Santa Pudenziana and Santa Práxedes or symbols of the Jewish and Gentile churches. Mosaic in the apse of Santa Pudenziana basilica, Rome, 401–417 ce.

The spread of Christianity to these regions occurred through distinct historical processes, often involving early apostolic traditions, royal conversions, and missionary networks.

Armenia

Christianity was established in Armenia around 300 CE, largely through the efforts of St. Gregory the Illuminator. According to tradition, Gregory converted King Tiridates III, who subsequently became the first monarch to impose Christianity as the state religion.12

Ethiopia

Ethiopia traces its Christian roots to the 1st century, though it was significantly Christianized in the 4th century by St. Frumentius. Frumentius won the confidence of the king at Aksum, leading to the baptism of King Ezana and the adoption of Christianity as the state religion.34

India

The Thomas Christians of India trace their origins to the arrival of St. Thomas in 52 CE. While the historicity of this event is debated, there is evidence of a Christian presence on the Malabar Coast by the 2nd or 3rd century.54

Central Asia

Christianity reached Central Asia primarily through Nestorian missions. These networks, based in Persia, utilized the Silk Road to spread the faith eastward, eventually reaching as far as China.678