Bayverse timeline: Earth edition Part 1
Basically I summarize the wiki with some additions
4.54 billion years: Earth forms around Unicron
65 million years ago: Quintessa sent her people to activate a Seed leading to the extinction of dinosaurs
17,000 BC: The 7 Primes land on Earth. 6 of the 7 sacrifice themselves to protect Earth from The Fallen.
10,000 BC: Allspark crashes on Earth
2560 BC: Great Pyramid of Giza is built around the Star Harvester
1200 BC: El Deir in Petra built to hide Tomb of the Primes
After 1200 BC: Seekers sent to find the Tomb of Primes. Only a riddle is discovered.
Before 1000 BC: Sentinel’s ship is shot down and is floatingly endlessly in space. Optimus becomes the new leader of the Autobots
1000 BC: Megatron crash lands on Earth when searching for the Allspark. As he didn’t inform anyone where he went, no one knew where to search for him. Starscream led with his absence. Megatron had left as he believed the war was won and thought it was time to search for the Allspark to help fix their planet. The war, however, continued as the Autobots were not going down. Some Decepticons became disillusioned with the Decepticons and became Autobots. This included Drift, Trench, and Crosshairs. This helped the Autobots get an advantage and this made the war last even longer.
Before 484 AD: The war killed Cybertron. Near the end of the war, Bumblebee lost his voice to Shockwave.The Knights discovered that Quintessa did not care for them or Cybertron. They took her staff and decided to hide on Earth. They assumed Quintessa would believe they went as far away from Unicron to keep the staff away. They assumed right and Quintessa did not immediately find them. Quintessa sent Lockdown to find the Lower Knights. The Dinobots, who also left Cybertron after being convinced from the Knights, went to other planets. Merlin discovers The Knights. They tell him of their destroyed planet and tell him to keep them a secret.
484 AD: Merlin asks The Knights of assistance against the Saxon hordes. Merlin is given The Staff.
After 484 AD: Merlin dies and most of the Knights protect his tomb. One decides to search for other Cybertronians to give refuge. The Cybertronians brought to Earth get in contact with the Order of the Witwiccans. Some of these Cybertronians include Bulldog, Hound, and Drift. Optimus and his main team, however, did not go to Earth due to them splitting up to try to find the Allspark. Bumblebee was the one who volunteered to go to Earth and search for the Allspark. After losing his voice, Bumblebee became withdrawn and way more violent, barely interacting with the humans on Earth and deciding not to interact with the Order of the Witwiccans unlike Hot Rod. (Hound came to earth around the 1700s. Bulldog and Drift came around the 1800s maybe? Hot Rod and Bumblebee came around the 1900s. Crosshairs might have come around the 1800s too?)
1897: Captain Archibald Witwicky discovers Megatron
1910s: Bulldog takes part in World War 1
1913: First Seven discover Allspark. The Allspark was dormant at that time so the signature couldn’t be reached to Bumblebee.
1927: Section Seven formed
1931: Hoover Dam bult around Allspark
After 1931: Megatron was brought over to Hoover Dam. Project Black Knife at some point is dismissed.
1940s: Bumblebee and Hot Rod fight with the Allies in the Devil’s Brigade. Bumblebee is still extremely violent at this time. He barely interacted with humans before this point in time.
1945: Watch that Killed Hitler…well killed Hitler.
After 1945: Hot Rod stays in Britain. Bumblebee continues his search for the Allspark. At some point Soundwave makes his way to earth as he learns that some Autobots were there and thought there might be something important there.
1960s: The Ark (Sentinel’s ship) lands on the moon. While this was no Allspark, Soundwave saw an opportunity with this discovery and sent some Decepticons there as well as informing Starscream of the situation. USSR finds Pillars being taken by Decepticons. The US has their astronauts investigate the ship. Starscream and some Decepticons start to make their way to Earth so see if the Pillars can be used to save Cybertron. They realize, however, that Sentinel is needed to make them work and that he was in stasis. They stay on earth to see if there is a way to use the Pillars without him and to make earth a somewhat base as well as kill any Autobots hiding on earth.
1970s: Soundwave and Laserbeak manipulate humans to stop further moon missions.
1980s: Chernobyl disaster caused by fuel cell extracted from the Ark
2003: Beagle 2 Rover reveals alien activity on Mars. This was most likely a Decepticon.
Before 2007: Soundwave gets some information about Sector Seven(perhaps one of his human companions learned about Sector Seven and it’s potential knowledge)