Answer the question at the end by quoting:

Gaius Julius Caesar (; 12 or 13 July 100 BC - 15 March 44 BC), known by his cognomen Julius Caesar, was a Roman politician and military general who played a critical role in the events that led to the demise of the Roman Republic and the rise of the Roman Empire. He is also known as a notable author of Latin prose. In 60 BC, Caesar, Crassus and Pompey formed a political alliance that dominated Roman politics for several years.
Caesar was still deeply in debt, but there was money to be made as a governor, whether by extortion or by military adventurism. Caesar had four legions under his command, two of his provinces bordered on unconquered territory, and parts of Gaul were known to be unstable. Some of Rome's Gallic allies had been defeated by their rivals at the Battle of Magetobriga, with the help of a contingent of Germanic tribes. The Romans feared these tribes were preparing to migrate south, closer to Italy, and that they had warlike intent. Caesar raised two new legions and defeated these tribes. In response to Caesar's earlier activities, the tribes in the north-east began to arm themselves. Caesar treated this as an aggressive move and, after an inconclusive engagement against the united tribes, he conquered the tribes piecemeal. Meanwhile, one of his legions began the conquest of the tribes in the far north, directly opposite Britain. During the spring of 56 BC, the Triumvirs held a conference, as Rome was in turmoil and Caesar's political alliance was coming undone. The Lucca Conference renewed the First Triumvirate and extended Caesar's governorship for another five years. The conquest of the north was soon completed, while a few pockets of resistance remained. Caesar now had a secure base from which to launch an invasion of Britain. In 55 BC, Caesar repelled an incursion into Gaul by two Germanic tribes, and followed it up by building a bridge across the Rhine and making a show of force in Germanic territory, before returning and dismantling the bridge. Late that summer, having subdued two other tribes, he crossed into Britain, claiming that the Britons had aided one of his enemies the previous year, possibly the Veneti of Brittany. His intelligence information was poor, and although he gained a beachhead on the coast, he could not advance further, and returned to Gaul for the winter. He returned the following year, better prepared and with a larger force, and achieved more. He advanced inland, and established a few alliances. However, poor harvests led to widespread revolt in Gaul, which forced Caesar to leave Britain for the last time. While Caesar was in Britain his daughter Julia, Pompey's wife, had died in childbirth. Caesar tried to re-secure Pompey's support by offering him his great-niece in marriage, but Pompey declined. In 53 BC Crassus was killed leading a failed invasion of the east. Rome was on the brink of civil war. Pompey was appointed sole consul as an emergency measure, and married the daughter of a political opponent of Caesar. The Triumvirate was dead. Though the Gallic tribes were just as strong as the Romans militarily, the internal division among the Gauls guaranteed an easy victory for Caesar. Vercingetorix's attempt in 52 BC to unite them against Roman invasion came too late. He proved an astute commander, defeating Caesar in several engagements, but Caesar's elaborate siege-works at the Battle of Alesia finally forced his surrender. Despite scattered outbreaks of warfare the following year, Gaul was effectively conquered. Plutarch claimed that during the Gallic Wars the army had fought against three million men (of whom one million died, and another million were enslaved), subjugated 300 tribes, and destroyed 800 cities.

when was the conquest of gaul?

In 55 BC, Caesar repelled an incursion into Gaul by two Germanic tribes,

Answer the question at the end by quoting:

Mohanlal Viswanathan was born in the village of Elanthoor in the Pathanamthitta district on 21 May 1960. He is the youngest child of Viswanathan Nair, a former bureaucrat and law secretary with the Kerala Government, and Santhakumari. He grew up at Mudavanmugal, Poojappura, at his paternal house in Thiruvananthapuram. Mohanlal studied at Government Model Boys Higher Secondary School, Thiruvananthapuram and graduated with a Bachelor of Commerce degree from Mahatma Gandhi College in Thiruvananthapuram.
Mohanlal made his acting debut in 1978 with the film Thiranottam, which was produced and made by Mohanlal and his friends--Maniyan Pilla Raju, Suresh Kumar, Unni, Priyadarshan, Ravi Kumar and a few others. Mohanlal played Kuttappan, a mentally disabled servant. Due to some issues with censorship, the film was not released on time. It took 25 years to release the film. In 1980, Mohanlal was cast in the lead antagonist role in Manjil Virinja Pookkal - the directorial debut of Fazil. The film became a major success. Mohanlal's friends had sent his application in response to an advertisement released by Navodaya Studio. He auditioned for the role in front of a panel that included professional directors. Displeased with his appearance, two of them gave him poor marks, but Fazil and Jijo Appachan gave him 90 and 95 marks out of 100. In an interview with Reader's Digest in 2004, Mohanlal said that his looks as a young man might have fit the villain's image. By 1983, Mohanlal was credited in more than 25 feature films, most of them had him playing negative (villain) roles. Films such as Ente Mohangal Poovaninju, Iniyengilum, Visa, Attakkalasham, Kaliyil Alpam Karyam, Ente Mamattukkuttiyammakku, Engane Nee Marakkum, Unaru and Sreekrishna Parunthu changed his image. Through Sasikumar's Ivide Thudangunnu, he became a successful hero with a "good heart". Mohanlal played his first comic lead role in an ensemble cast in the 1984 comedy Poochakkoru Mookkuthi, directed by Priyadarshan, as a young man in love with a girl whom he mistakenly believes to be rich. It also marked the beginning of the Mohanlal-Priyadarshan duo, who as of 2016, have worked together in 44 films. In 1985, he recorded a song for the film Onnanam Kunnil Oradi Kunnil. Uyarangalil, Nokketha Doorathu Kannum Nattu, Boeing Boeing and Aram + Aram = Kinnaram were some of his films in this period.

Did he have another acting role after Thiranottam?
lead antagonist role in Manjil Virinja Pookkal - the directorial debut of Fazil.