Auguste Chapdelaine, Chinese name Mǎ Lài (; 6 February 1814 – 29 February 1856) was a French Christian missionary of the Paris Foreign Missions Society. France used his death – Chapdelaine was executed by Chinese officials – as a casus belli for its participation in the Second Opium War. The Taiping Rebellion led to suspicion of Christians, and foreigners were forbidden to enter the area.
After a stay in Guangzhou, he moved to Guiyang, capital of the Guizhou province, in the spring of 1854. In December, he went, together with Lu Tingmei, to Yaoshan village, Xilin County of Guangxi, where he met the local Catholic community of around 300 people. He celebrated his first mass there on 8 December 1854. He was arrested and thrown into the Xilin county prison ten days after his arrival and was released after sixteen or eighteen days of captivity.
Following personal threats, Chapdelaine returned to Guizhou in early 1855, and came back to Guangxi in December of the same year. He was denounced on 22 February 1856 by Bai San, a relative of a new convert, while the local tribunal was on holiday. He was arrested in Yaoshan, together with other Chinese Catholics, by orders of Zhang Mingfeng, the new local mandarin on 25 February 1856. Chapdelaine was accused of stirring up insurrection and refused to pay a bribe. Condemned to cage torture (zhanlong), he was first beaten one hundred times on the cheek by a leather thong, which caused his teeth to fly out, his face mutilated, and his jaw lacerated. He was locked into a small iron cage, which was hung at the gate of the jail. The planks he stood on were gradually removed, placing a strain in the muscles of the neck, and leading to a slow and painful death from suffocation. He had already died when he was decapitated. His head was hung from a tree by his hair. Children were said to have thrown stones at the head until Chapdelaine's head fell to the ground and was devoured by street dogs and hogs.
Diplomacy
thumb|Martyrdom of Auguste Chapdelaine.
His death was reported by the head of the French missions in Hong Kong on 12 July. The chargé d'affaires, de Courcy, in Macau learned of the execution on 17 July and filed a vigorous protest on 25 July to the Chinese Imperial Viceroy Ye Mingchen. On 30 July, he sent a report to the French foreign office of the execution.
The viceroy responded to de Courcy by pointing out that Chapdelaine had already violated Chinese law by preaching Christianity in the interior (the 1844 treaty signed with France only permitted for the propagation of Christianity in the five treaty ports opened to the French). He also claimed that the priest was in a rebel territory and that many of his converts had already been arrested for acts of treason, and the viceroy further claimed that Chapdelaine's mission had nothing in common with the propagation of religion.
Under French diplomatic pressure, the mandarin who ordered his death was later demoted. When Britain went to war with China in the same year (commencing the Second Opium War (1856–1860)), France initially declared its neutrality, but de Courcy made it known that French sympathy was with the British due to the Chapdelaine incident.
Lord Elgin, the British High Commissioner for China commented on the French ultimatum given prior to France's entry to the war: