v. Simple past tense and past participle of caption.
The Century Dictionary and Cyclopedia
Headed; entitled; having the heading or title of: as, an effective poem captioned the “Song of the Innuit.”
Word Usage
"The South China Morning Post printed a picture of President Hu Tuesday with his name captioned in Chinese characters as Hu Jia, a Chinese activist serving 3.5 years in jail for subversion."