Converted to Christianity in the context of "Santa Maria del Popolo"

During the reign of the Roman emperor Constantine the Great (306–337 AD), Christianity began to transition to the dominant religion of the Roman Empire. Historians remain uncertain about Constantine's reasons for favoring Christianity, and theologians and historians have often argued about which form of early Christianity he subscribed to. There is no consensus among scholars as to whether he adopted his mother Helena's Christianity in his youth, or, as claimed by Eusebius of Caesarea, encouraged her to convert to the faith he had adopted.

Constantine ruled the Roman Empire as sole emperor for much of his reign. Some scholars allege that his main objective was to gain unanimous approval and submission to his authority from all classes, and therefore he chose Christianity to conduct his political propaganda, believing that it was the most appropriate religion that could fit with the imperial cult. Regardless, under the Constantinian dynasty Christianity expanded throughout the empire, launching the era of the state church of the Roman Empire. Whether Constantine sincerely converted to Christianity or remained loyal to paganism is a matter of debate among historians. His formal conversion in 312 is almost universally acknowledged among historians, despite that it was claimed he was baptized only on his deathbed by the Arian bishop Eusebius of Nicomedia in 337; the real reasons behind it remain unknown and are debated also.

Syngman Rhee (Korean: 이승만; Hanja: 李承晚; pronounced [iː.sɯŋ.man]; 26 March 1875 – 19 July 1965), also known by his art name Unam (우남; 雩南), was a South Korean politician who served as the first president of South Korea from 1948 to 1960. Rhee was also the first and last president of the Provisional Government of the Republic of Korea from 1919 to his impeachment in 1925 and from 1947 to 1948. As president of South Korea, Rhee's administration was characterised by authoritarianism, limited economic development, and in the late 1950s growing political instability and public opposition to his rule.

Born in Hwanghae Province, Joseon, Rhee attended an American Methodist school, where he converted to Christianity. He became a Korean independence activist and was imprisoned for his activities in 1899. After his release in 1904, he moved to the United States, where he received degrees from American universities and met Presidents Theodore Roosevelt and Woodrow Wilson. After a brief 1910–12 return to Korea, he moved to Hawaii in 1913. In 1919, following the Japanese suppression of the March First Movement, Rhee joined the right-leaning Korean Provisional Government in exile in Shanghai. From 1918 to 1924, he served as the first President of the Korean Provisional Government until 1925. He then returned to the United States, where he advocated and fundraised for Korean independence. In 1939, he moved to Washington, DC. In 1945, he was returned to US-controlled Korea by the US military. On 20 July 1948, he was elected the first president of the Republic of Korea by the National Assembly, ushering in the First Republic of Korea.

Backsliding, also known as falling away or described as "committing apostasy", is a term used within Christianity to describe a process by which an individual who has converted to Christianity reverts to pre-conversion habits and/or lapses or falls into sin, when a person turns from God to pursue their own desire. To revert to sin or wrongdoing, especially in religious practice, someone lapses into previous undesirable patterns of behavior. To be faithful, thus to believe backsliding is a reversion, in principle upholds the Apostle Paul’s condition in salvation: "If you declare with your mouth, 'Jesus is Lord,' and believe in your heart that God raised him from the dead, you will be saved." (Romans 10:9)

In Christianity, within the Roman Catholic Church as well as those denominations which teach Arminianism (such as the Methodist churches), backsliding is a state which any free-willed believer is capable of adopting. This belief is rejected by Reformed Christians endorsing the perseverance of the saints doctrine. In these denominations, it is taught that the backslidden individual is in danger of eventually going to Hell if he does not repent (see Conditional security). Historically, backsliding was considered a trait of the Biblical Israel which would turn from the Abrahamic God to follow idols. In the New Testament church (see Acts of the Apostles and Christianity in the 1st century), the story of the Prodigal Son has become a representation of a backslider who repented.

The Bettiah Christians (Hindustani/Bhojpuri: Béttiah Masīhī or Béttiah ʿĪsāʾī), also known as Betiawi Christians, are the northern Indian subcontinent's oldest Christian community, which emerged in the 18th century. The origins of the Bettiah Christian community lie in Champaran in what is now the Indian state of Bihar, in which the king of the Bettiah Raj, Maharaja Dhurup Singh, invited Roman Catholic missionaries of the Order of Friars Minor Capuchin to establish the Bettiah Christian Mission there.

Upper and middle-caste Hindus who converted to Christianity in the 18th and 19th centuries constitute the majority of the ethnoreligious community of Bettiah Christians, though it has incorporated those from former Muslim, Newar and scheduled caste heritage as well.