I am looking for the term for the sentence structure of the type "< verb > + < adverbial phrase >, < main clause >."
Examples of this pretty common structure are
- "Born in England, he moved to New Zealand when he was in his thirties." (https://en.wikipedia.org/wiki/James_Bragge)
- "Trained in mathematics, he participated in the early twentieth century movement to mathematize economics." (http://www.uh.edu/engines/epi2692.htm)
- "Believing the world to be round, he was certain that by sailing to the west, he could reach the Orient" (http://themutineer.org/america-amerigo-or-amerike/)
Are these just adverbial clauses at the start of a sentence, or is there a more specific term?