Who taught Frederick Douglass to read?

Frederick Douglass was taught "his letters" by Mrs. Auld. Who was later advised by her husband to no longer teach Douglass how to read or spell because " it was unlawful, as well as unsafe, to teach a slave to read. To use his own Words further," After Mrs. Auld stopped teaching Douglass, he tried to learn further by asking, bribing, and tricking homeless white children as to further his abilities.