Before Christ (BC)

4.54 billion years B.C-the earth estimated age, with an error range of 50 million years. Source.

165 million years B.C-Dinosaurs roam the earth. Source.

245-66 million years B.C-Non-bird dinosaurs live in a time known as Mesozoic Era. Source.

65 million years B.C-dinosaurs go extinct at end of Cretaceous Period after living on earth 165 million years. Source.

33.9-56 million years B.C  Eocene epoch. Eocene/Perissodactyl.

2.4 million to 1/4 million years B.C-The FIRST HUMANS, meaning anyone belonging to the genus "homo", emerge in Africa, such as Homo Habilis. Source.

1.9 million to 1.8 million years B.C-Humans known as Homo Rudolfensis live in East Africa.

1.89 million and 110,000 years ago B.C-Humans known as Homo Erectus live in Northern, Eastern, and Southern Africa, Western Asia and East Asia. 

300,000 and 400,000 years ago B.C-a group of Homo Heidelbergensis left Africa.

50,000 to 150,000 years ago-Language first evolved, which is around the time when modern Homo sapiens evolved. 

160,000 and 90,000 years ago B.C-Homo Sapiens evolve in Africa, before migrating first to Middle East and Europe and later to Asia, Australia, Americas.

17,000 B.C-Prehistoric hunters and gatherers inhabited Avella, Pa. Source.

100 B.C-Julius Caesar is born. Source.

44 B.C-Julius Caesar died.Source.

45 B.C-In the Julian calendar that Julius Caesar proposed, March 25th is set as the date of the spring equinox; this was already the starting day of the year in the Persian and Indian calendars. Source.

Battle of  Munda conflict ended the ancient Roman civil war between the forces of Pompey the Great and those of Julius Caesar. Source. 

42 B.C-Tiberius Caesar Augustus is born. Source.

4 B.C-Jesus is born around 4 B.C, according to the Gospels. Source.

4 B.C-Lucius Junius Moderatus Columella is born. He would later become a prominent writer on agriculture in the Roman empire. Source.

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Interesting reads on early humans:

~Wiki

~Who are the Denisovans? 

~Denisovan DNA to future Humanity

~Ethnic group has highest level of Denisovan DNA

~Archaic humans

~DNA reveals mysterious human cousin with huge teeth