Empress is an embedded relational DBMS that supports SQL.
The first version of Empress (originally called MISTRESS) was developed in 1979 at the University of Toronto.
Relational
SQL
Embedded
http://www.empress.com/
Empress Software Inc.
CA
1979
MISTRESS
Commercial
Proprietary
https://en.wikipedia.org/wiki/Empress_Embedded_Database
Typhoon
