If you mean when was Black Betty written, no one can say for certain. It was a British pub song in the early 1700's, then a patriot march song during the Revolutionary War. Later it was sung by slaves and/or prisoners on chain gangs. If you mean when was it first recorded, that would be in 1933, by a prisoner known as "Ironhead" Baker, but it didn't really make it. The first really popular recording was by another prisoner, "Lead Belly" Ledbetter, in 1939. The most famous version (imo) is the one by Ram Jam, recorded in 1977.
Sleeping Betty was created in 2007.
Black Betty was created in 1977.
Miss Betty was created in 1898.
Atomic Betty was created on 2004-09-06.
The Audience with Betty Carter was created on 1979-12-06.
How Betty Got Her Grieve Back was created on 2007-09-27.
Betty White's Off Their Rockers was created on 2012-01-16.
The duration of Sleeping Betty is 540.0 seconds.
Betty's Bunch was created on September 1, 2021.
Miss Betty was created in 1898.
Betty Draper was created in 2007.
Betty Rubble was created in 1960.
Betty Suarez was created in 2006.
Betty Eagleton was created in 1994.
Betty - film - was created in 1992.
Betty Clawman was created in 1988.
Betty Wrong was created in 1991.
Betty Brant was created in 1963.
Betty Rides was created in 1993.