History of PostgreSQL

I have gotten some dates from the old Ingres and Postgres source code.
Interesting how old these are:

PostgreSQL is the most advanced open-source database server. It is
Object-Relational(ORDBMS), and is supported by a team of Internet
developers. PostgreSQL began as Ingres, developed at the University
of California at Berkeley(1977-1985). The Ingres code was taken and
enhanced by Ingres Corporation, which produced one of the first
commercially successful relational database servers. (Ingres Corp.
was later purchased by Computer Associates.) The Ingres code was
taken by Michael Stonebraker as part of a Berkeley project to develop
an object-relational database server called Postgres(1986-1994). The
Postgres code was taken by Illustra and developed into a commercial
product. (Illustra was later purchased by Informix and integrated
into Informix's Universal Server.) Several graduate students added
SQL capabilities to Postgres, and called it Postgres95(1995). The
graduate students left Berkeley, but the code was maintained by one of
the graduate students, Jolly Chen, and had an active mailing list.

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