Unknown date
The Goa'uld take the Unas as a host species on their primordial homeworld.

The Goa'uld abandon there homeworld and travel through the stargate.

Four to ten thousand years ago
Ra discovers humanity and takes his first human host, Goa'uld attention is focussed on Earth for the next few thousand years.

Sokar, ruling Earth and the System Lords, is overthrown by an alliance of Goa'uld including Ra, Apophis and Cronos who banishes him.

Seth seals Isis and Osiris inside statis jars.

Marduk is sealed in his ziggurat by his own priest for being so evil.

Hathor is sent to Earth by Ra in order to destroy humanity, she rebels and is sealed inside a Mayan pyramid by Ra.

Belus rules Babylonia and kills Omoroca, Nem's mate.

Nefertem brings humans to another planet on the continents of Bedrosia and Optrica

Seth attempts a revolt against Ra and is forced into hidding on Earth after the revolt fails.

2200 BC
Yu rules as the first emperor of China, bringing forth many great advancements.

Two thousand years ago
Egeria comes to Earth as the advisor of roman consul Numa Pompilius in an attempt to overthrow Ra. She is found out and sealed on the planet Pangara by Ra, but not before spawning the Tok'ra movement against the Goa'uld System Lords.

Earth revolts against Ra and bury the stargate, preventing any further Goa'uld intervention. Most Goa'uld tend to their own domains and forget about Earth.

One thousand years ago
Anubis is banished from the System Lords for unspeakable crimes. The System Lords attempt to have him murdered in vain.

The Protected Planets' Treaty between the Goa'uld and the Asgard is speculated to have begun around this time.

Unknown date
The Goa'uld attack Retalia, leaving the Re'tu civilisation in ruins.

1994
Ra encounters a stargate team from Earth and is killed in a nuclear explosion in orbit of Abydos.

1997
Apophis attacks several planets including Earth in his search for host to Amaunet and Klorel. Amaunet takes Sha're as her host and Klorel takes Skaara.

Apophis encounters SG-1 on the Nox homeworld in search of the Fenri.

Pelops' human evolution experiment on Argos is halted by SG-1.

Unas is killed by Thor's hammer on Cimmeria, which is in turn destroyed by SG-1.

Hathor is freed by archeologists and tries to take over the SGC, she fails and goes to Chulak in order to start a new army against the System Lords.

Nirrti whipes out the entire population of Hanka save Cassandra whom she turns intro a living nuclear bomb.

1998
Apophis and Klorel attempt a failed invasion of Earth. Apophis' rank as System Lord is lost after his failure.

Samantha Carter is briefly taken over by the Tok'ra Jolinar, which is killed by an ashrak, who is in turn killed by Teal'c.

Heru-ur attempts to invade Cimmeria, but is foiled by the intervention of the Asgard. Apophis attempts to brainwash Teal'c's son Rya'c in an attempt to rally more Jaffa support.

Amaunet gives birth to the harcecis on Abydos. The child is hidden by Daniel Jackson who puts the blame on Heru-ur.

The Tok'ra enter an alliance with Earth.

Sokar begins his rise to power and manages to capture and torture Apophis before he escapes into the SGC.

Apophis' corpse is returned to Sokar in order to prevent an attack on Earth. Sokar resurect's Apophis and sends him to the hellish prison-moon of Netu.

Hathor manages to capture SG-1 and interrogate them for information on the status of the Goa'uld empire.

1999
Hathor is killed by Jack O'Neill and her base is destroyed.

Seth is tracked down and killed on Earth by Samantha Carter, SG-1 and Selmak.

Cronos, Nirrti and Yu arrive on Earth in order to negociate Earth in the Protected Planets' Treaty. After sabotage by Nirrti the treaty is accepted by Yu and Cronos. Nirrti is imprisoned by Cronos.

Sokar sends bounty hunter Aris Boch to hunt SG-1 and the Tok'ra Korran.

Amaunet is killed by Teal'c as she tried to kill Daniel Jackson with her ribbon device.

Apophis is found to alive on Netu and attempts a revolt against Sokar. When Sokar attempts to stop his revolt, but Netu explodes and destroys his mothership, leaving Apophis to take control of Sokar's vast forces.

After a triad on Tollana, Klorel is removed from Skaara's body. Zipacna attempts a failed invasion of Tollana and retreats.

Apophis attacks Kheb in search of the harcecis.

2000
Apophis' advanced mothership prototype is destroyed by SG-1 using the Antoniek armbands.

Tanith takes Hebron as his host, kills Sho'nac and believes to have infiltrated the ranks of the Tok'ra successfully.

SG-1 stumble on the primordial homeworld of the Goa'uld.

Osiris is freed by Sarah Gardner and flees Earth with a promise of vengence when confronted by Daniel Jackson, Samantha Carter and Janet Fraiser.

Apophis and Heru-ur attempt an alliance, but the attempts fails and Heru-ur is destroyed by Apophis.

2001
Cronos is confronted with SG-1 and their robotic doubles. He is killed by Teal'c and his double on-board his mothership in orbit of Juna.

Tanith supplies Apophis with the location of the Tok'ra base on Vorash. Apophis and SG-1 are thrown in another galaxy. They make it back thanks to Replicator intervention and Apophis is killed when his mothership filled with Replicators crashes on Delmak.

Marduk is freed by SG-1 and a Russian team and killed by Colonels O'Neill and Zuckov.

Tanith forces the Tollans to build advanced weapons to use against Earth, but is forced to destroy Tollana when the attempts fails due to intervention from SG-1 and the Tollan Narim.

An unknown Goa'uld takes Adrian Conrad on Earth as a host. He is detained by the NID.

Tanith is killed while attempting to destroy SG-1 with his alkesh.

Yu, Olokun, Morrigan, Baal, Bastet, Kali, Savorg and Osiris meet on a space station in order to renew the Goa'uld System Lord alliance and allow Anubis to return among them. Yu is stabbed by Osiris during a misunderstanding.

The System Lords attempts to destroy Earth by lauching an asteroid with a naquadah core at Earth.

Imhotep attempts to round up as many rebel Jaffa as possible in order to destroy them and attacks bases belonging to Zipacna, Nirrti and Yu. Yu informs Teal'c of the duplicity and attacks Imhotep's base.

Svarog is "sent away" when his invasion of Latona fails and the Sentinel is activated.

Yu goes on the offensive against Anubis.

Osiris and Anubis attack an Asgard laboratory and capture Thor. They are halted by the intervention of SG-1, Heimdall and Freyr who confronts Anubis' mothership with three O'Neill-class Asgard ships.

2002
Anubis attempts in vain to destroy Earth using an Ancients' weapon that turns stargates into doomsday devices.

Anubis' former mothership is abandoned and brought to Earth by Thor's mind who is still inside the ship's computer after having been downloaded by Anubis. The ship crashes in the Pacific Ocean.

A group of immature Goa'uld cloned from Adrian Conrad's symbiote attempt to escape Earth by building a ship. They are halted thanks to SG-1.

Jack O'Neill is captured, tortured, killed and resurected by Baal in order to find the information contained by the Tok'ra Kan'an whom used O'Neill as a host.

Anubis knowing that one of his underlords, Khonsu, was a Tok'ra spy, has Herak kill Khonsu after capturing SG-1(who escape).

Adrian Conrad and Colonel Simmons attempt to hijack Earth prototype ship called "Promtheus". Simmons is taken over by Conrad's Goa'uld and is in turn thrown out an airlock by Colonel O'Neill.

Nirrti uses an Ancient DNA-altering device to experiment on a planet's population. She is killed when her deception is revealed to the people's leaders.