All 4 Uses

clemency
in
The Count of Monte Cristo
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Do not you recollect, I came about six weeks ago to plead for clemency, as I come to-day to plead for justice.†
Chpt 13-14 *
The inspector visited, one after another, the cells and dungeons of several of the prisoners, whose good behavior or stupidity recommended them to the clemency of the government.†
Chpt 13-14
and Clement VII.†
Chpt 15-16

clement = merciful
Napoleon certainly he knew something of, inasmuch as he had seen and spoken with him; but of Clement VII.†
Chpt 15-16

Definitions:

(1) (clemency as in: the judge showed clemency)
mercy
(2) (meaning too rare to warrant focus)
A less common meaning is mildness and usually references good weather in the form clement or bad weather in the form inclement.