Qué significa don?
After a little research i found that it is also used as a show of great respect, younger people addressing their elders. Also used by anyone in reference to a persons status, as a lawyer, doctor, leader ect... i think it was used widely in the past, and not as much today..
Something like "Master" perhaps. He usually is the owner of something and employs people, by which he is called "Don whatever" He may also just be a community leader or a noble.
Oh and a woman is "Doña"