Final answer:
Mark Antony displays unwavering loyalty and support for Caesar during Act 1 of 'Julius Caesar', as evidenced by his role in the Second Triumvirate to avenge Caesar's death.
Step-by-step explanation:
During Act 1 of Shakespeare's play Julius Caesar, Mark Antony's attitude towards Caesar is one of loyalty and support. Antony was a trusted general and close ally to Caesar, having been left in charge of Caesar's legions in the latter's will. Antony's commitment to Caesar's legacy is evident as he joins the Second Triumvirate with Octavian and Lepidus after Caesar's death, and they collectively take actions to avenge Caesar by targeting his assassins. Despite the public and some political figures perceiving Caesar as a potential tyrant, Antony's regard for Caesar remains unwavering, showcasing his devotion and alignment with Caesar’s ideals.