Soon after he had returned from the northern provinces, Caligula made his rule more excessive, as he imposed severe taxes, confiscated property, and used public auctions to raise funds.
According to Suetonius, he claimed to own the state and its people, and he frequently insulted senators during public appearances.
He constructed a palace that absorbed the Temple of Castor and Pollux, using it as a private entry hall, and invited foreign kings to worship him as a living deity.
Tensions in the capital worsened as the Senate had already been sidelined by imperial reforms and lost any remaining influence.
The Praetorian Guard had been well paid and had grown uneasy. On 24 January AD 41, while walking through a palace corridor during a festival, Caligula was attacked by officers of the Guard.
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Caligula Vesta AS with gash attempt to Damnatio of "C" in Caesar and face.

This coin is defaced and is evidence of the unpopularity of Gaius Caligula. On some Vesta bronzes you will find the "C" in CAESAR obliterated. On this coin (Caligula in front of the Temple of DIVO AUGUSTUS sacrificing) the face has been obliterated and it was not mentioned in the catalog. The date of 41 A.D. seems to show more damnatio damage than years 37-40 A.D. on Caligulan imperial coinage? Joe Geranio
Gaius (Caligula). AD 37-41. Æ "Medallic" Sestertius (30.30 g, 7h). Rome mint. Struck AD 37-38. Pietas seated left, holding patera and resting arm on small draped figure standing facing on basis / Gaius standing left, holding patera over garlanded altar; victimarius holding bull for sacrifice and attendant holding a patera standing on either side; garlanded hexastyle temple of Divus Augustus in background; pediment decorated with sacrificial scene; quadriga and Victories as acroteria; statues of Romulus and Aeneas along roof line. RIC I 36.

Note Damnatio attempt!! Even rarer are head and body belonging together. Photo courtesy John Pollini.
Statue of Caligula
Roman, A.D. 38-41
Marble