Marcus showed a great deal of respect to the Roman Senate and routinely asked them for permission to spend money even though he did not need to do so as the absolute ruler of the Empire. In one speech, Marcus himself reminded the Senate that the imperial palace where he lived was not truly his possession but theirs. In 168, he revalued the denarius, increasing the silver purity from 79% to 82% – the actual silver weight increasing from . However, two years later he reverted to the previous values because of the military crises facing the empire.