Analysis of information sources in references of the Wikipedia article "Giuseppe Maria Bernini" in English language version.
Cherubim John, a writer and historian, said the Bettiah community began after Italian Capuchin Father Joseph Mary Bernini cured the local queen of an "incurable" illness. The king donated 16 hectares of land later known as the "Christian Quarters" to the Capuchins. The king allowed Father Bernini, who was on his way to Tibet, to preach, and helped build a church next to his palace.
One of the Capuchin missioners, Father Joseph Mary, spent some time in Bettiah in 1740 en route to Tibet, and he managed to cure the queen of Bettiah of a serious malady. The King of Bettiah, Dhruva Singh, asked the priest to stay in his kingdom, but the priest said he could not do so unless the Vatican granted permission. Subsequently, Dhruva Singh wrote two letters to Pope Benedict XIV requesting that the missioners be allowed to open a station in Bettiah. The pope replied to him on May 1, 1742, saying the Capuchins could stay and preach the Gospel in the kingdom. Father Joseph Mary thus founded the Bettiah Mission in 1745.