What is "fratricides"

Usage examples of "fratricides".

If Algernon’s fratricides had been made known, Crispin would have been stripped of the title.

In those days, having journeyed a bit in the Italian peninsula, I no longer had firm opinions on the subject: I had heard of the monks of Altopascio, who, when they preached, threat­ened excommunications and promised indulgences, ab­solved those who committed robberies and fratricides, homicides and perjury, for money.