|This article may be expanded with text translated from the corresponding article in the Vietnamese Wikipedia. (February 2009)|
Trương Vĩnh Ký (chu Han 張永記), known as Pétrus Ky and Jean-Baptiste Pétrus, (Vĩnh Long Province, 6 December, 1837 - 1 September 1898) was a Vietnamese scholar whose publications helped improve understanding between colonial Vietnam and Europe. His works helped popularize the romanized script of the Vietnamese language, Quốc Ngữ, leading to its officialization in the early 20th century. He served in the French colonial regime as a linguist, and also translated many literary works into modern Vietnamese.
Truong Vinh Ky, also called J.B. Truong Chanh Ky, or Petrus Ky, was born on December 6, 1837 in Vinh Thanh Village, Minh Ly Canton, Tan Minh District, Vinh Long Province (now is Vinh Thanh Commune, Cho Lach District, Ben Tre Province).
His father was Commander Truong Chanh Thi, his mother was Nguyen Thi Chau. He started to learn the Mandarin language at as early as 5 years of age. When he was 9, he lost his father. In Cai Nhum at that time there was a Christian missionary teaching Latin language. At 12, Ky studied the Christian Bible with Father Hue (or the Priest Belleveaux) and followed him to the Pinhalu School in Phnom Penh, Cambodia. In 1851, Truong was granted a scholarship by this school to study at the Penang Seminary, then the main centre of Roman Catholic training for Southeast Asian countries. At the Penang Seminary, Truong Vinh Ky showed outstanding learning skills to the ideological and knowledge on natural as well as social sciences, that even some of the famed personalities at that time were surprised and praised his excellent brainpower and erudite knowledge. He also proved himself skillful in linguistics. Beside the commonly used languages at the time such as French, English, Latin, Greek, Hindi, and Japanese, he was also proficient in Chinese, Spanish, Malay, Lao, Thai, Burmese. Truong Vinh Ky worked mainly in the cultural domain, but he also worked for 8 months at the Viện cơ mật (Secret Affairs Institute, Privy Council) in the court at Huế and another 8 months as an interpreter in the Vietnamese delegation to France. When the French troops attacked the Province of Gia Dinh in December, 1859, he was appointed as an interpreter to the Occupying forces.
Travel to Europe 
In June, 1863, he accompanied Phan Thanh Gian, the chief delegator sent to France by the Hue Court to negotiate the retrieval of provinces lost into the French hands. This trip was a very good chance for Truong to meet with famous figures at the time such Victor Hugo, Littre, Renan, and French statesmen. He also had chances to tour the world, coming to countries such as Egypt, Portugal, Spain, Italy, etc.
The trip also gave him a quite broader perspective view of his own country and the blight of his fellow countrymen. After all of the 6 provinces of the Cochinchine were lost to the French invaders, Truong was appointed as the first Annamite official to serve under the French protective regime.
Professor of French language 
He was professor of French language at the Interpreter School (1866-1868), Chief editor for the Gia Dinh News (1868), Director of the Pedagogic School and at the same time Secretary of the City Council of Cho Lon (1872), professor in French language for the French and Spanish expats at the Collège des Administrateurs Stagiaires in 1874. In February, 1876, Truong was appointed as the Supervisor for king Đồng Khánh at the Viện cơ mật and stayed in that job until October, 1876. Then he went back to Saigon.
Later years 1886-1898 
He was no longer accredited after the abrupt death of Governor-General Paul Bert on November 11, 1886, and spent most of the time doing research and teaching at the Interpreter School and the Collège des Administrateurs Stagiaires. He died on 1 September 1898, in Saigon, aged 62.
During his 40 years working in the cultural field, Truong Vinh Ky created 118 works of many genres such as research, collecting, translation, transcription, tens of which were written in French. He was also a member of science societies and associations in Europe. In the time of transition and cultural intersection between West and East in Vietnam at the end of 19th and early 20th century, Truong had such a grandiose career that the French scholar J. Bouchot called him "the only scholar in Indochina and even the modern China " In Vietnam, Truong was praised as the most excellent language and cultural researcher. Though there are some ideas criticizing him for having cooperated with the French colonialists, no one ever doubts his excellent learning and profound knowledge, as well as his invaluable contributions to Vietnam's cultural development during the early days of modern civilization. There have been many research books and biographical as well as critic books about Truong Vinh Ky, his life and his works. All were published and have been reprinted many times in many ways for many later researchers to get to understand him.
Translations and publications 
In the cultural area, Truong Vinh Ky was admired greatly as a scholar with broad and profound knowledge in various fields of study, both in social and natural sciences. He had considerable achievements in collecting, transcription and translation from foreign languages into Vietnamese. Some of his best-known transcription and translation works include Truyện Kiều (The Story of Miss Kieu), Lục Vân Tiên (written in Mandarin language 陸雲僊, by Nguyen Dinh Chieu), Phan Trần, and Gia huấn ca (Book of Familial Educating), Lục súc tranh công (The Six Animals Vying for Services).
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- Patricia M. Pelley Postcolonial Vietnam: New Histories of the National Past Page 128 2002 "Working with phenomenal energy, the Catholic converts Trương Vĩnh Ký and Huỳnh Tịnh Của, for example, translated literary works ."
- Understanding Vietnam - Page 69 Neil L. Jamieson - 1995 "These two men, Truong Vinh (Petrus) Ky and Huynh Tinh (Paulus) Cua, ... They sent him to a Catholic school in Cambodia and then to a seminary in Penang, where he acquired a firm grounding in both Asian and Western civilization and ..."
- Vietnam Fights and Builds - Page xlix 1964 "Petrus Ky Three years later Petrus Ky once again followed Father Long, this time to Penang (Malaysia). As a brilliant pupil and a devoted believer, Petrus Ky was admitted to the Jesuits' Far East Catholic Mission. During his six years in Penang ..."