Why was Caesar known as a tyrant?

Some of Caesar’s actions could have been seen as tyrannical. One of those actions was his marching on Rome at the head of his army, where he met little resistance and he took control of Rome by force had destroyed completely te previous system. Caesar came across as brutal and harsh, and therefore his actions have been misinterpreted and misunderstood. Little did he want to ruin the system of Rome, but he had no other choice if he wanted to make it great History