A couple things between 100 and 44 BC
Archbishop Ussher used the Julian Calendar to make his predictions. Julius Caesar introduced his Julian calendar in 45 BCE. The Julian calendar was based on the solar year which has 365.25 days. It operated through a 365-day regular cycle, adding an extra day (the four quarter-days) every fourth year - "a leap year."
Caesar died March 15, 44 BC
100 BC Glass-blowing is discovered in Syria
74 Julius Caesar defeats Pharnakes, king of Pontus (now northeastern Turkey), son of Mithridates 63 Roman general Pompey renames Judea & Palestine after subjecting them. 59 Julius Caesar named consul (highest rank) by the Roman Senate, begins to conquer Gaul and Britain. Jan. 10, 49 Julius Caesar crosses the Rubicon from Gaul into Italy with his army to establish himself as a dictator over the Roman nobility and Pompey. 46 Julian calendar of 365.25 days instituted by Romans as the first leap year
100-44 BCE Julius Caesar
90 BCE Civil war in Rome, Marius vs. Sulla. Sulla wins
71 BCE Revolt of slaves and gladiators in Rome, led by Spartacus, put down by Pompey and Crassus
70-19 BCE Virgil, Roman poet 69 BCE Hyrcanus II deposed (Israel
65-8 BCE Horace, Roman poet
64 BCE Roman occupation of Palestine
63 BCE Pompey makes Palestine part of the Roman province of Syria
63 BCE - CE 14 Gaius Octavius (Augustus)
59 BCE First Triumvirate of Rome (Caesar, Crassus & Pompey)
47 BCE Cleopatra of Egypt has Pompey murdered
47 BCE Library of Alexandria burned
47 BCE Herod made governor of Galilee
46 BCE The Julian Calendar - leap years introduced
44 BCE Julius Caesar assassinated in Rome