Short answers, pulled from the story.
Germanicus died on the 10th of October AD 19 in Antioch after a period of illness during which he believed the governor of Syria, Gnaeus Calpurnius Piso, was poisoning him. Piso was tried for the death but died before the trial ended, and the accusation of poison was never proven. Ancient sources, including Tacitus, also suspected Emperor Tiberius of involvement.
Germanicus led three campaigns across the Rhine between AD 14 and AD 16, avenging the Roman defeat at the Battle of the Teutoburg Forest and recovering two of the three legionary eagles lost in that battle. His forces defeated Arminius at the Battle of the Weser River in AD 16, where fighting lasted from the fifth hour of daylight until nightfall.
Germanicus was born on the 24th of May 15 BC to Nero Claudius Drusus and Antonia Minor. His paternal grandmother was Livia, wife of the emperor Augustus, and his maternal grandparents were the triumvir Mark Antony and Augustus's sister Octavia Minor. He was the brother of the emperor Claudius, the father of the emperor Caligula, and the maternal grandfather of the emperor Nero.
Romans compared Germanicus to Alexander the Great because both died young in mysterious circumstances, both were renowned military commanders of exceptional physical presence, and both were considered to possess outstanding virtuous character. Tacitus records that many Romans believed Germanicus would have surpassed Alexander's achievements had he become emperor.
In AD 4, Germanicus wrote a Latin translation and reworking of Aratus's Phainomena, a Greek poem on astronomy. He replaced the opening hymn to Zeus with a passage honoring the Roman emperor, and wrote in a style suited to Roman readers familiar with Ovid and Virgil rather than imitating Cicero's earlier translation. The work survived antiquity and was popular enough to attract scholarly commentaries into the medieval era.
On the 26th of May AD 17, Germanicus celebrated a triumph in Rome. The procession included Thusnelda, the captured wife of Arminius, and her three-year-old son, along with other captives and displays representing mountains, rivers, and battles. Tiberius distributed money to the Roman people in Germanicus's name, and coins later issued under Caligula commemorated the event with the legend "Standards Recovered. Germans Defeated."