Former slave lectured against slavery in great britain and the north

The correct answer is Frederick Douglass.

Douglass was born a slave in Maryland and escaped. After escaping, Douglass became a leader in the abolition movement in New England and lectured around the world, writing and speaking about his experiences as a slave and the institution of slavery.

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.