It is Latin (not Spanish!) for "The Law of Retaliation", which is to say, "The punishment should fit the crime". It's oldest expression is in Exodus 21:24, Leviticus 24:20, Deuteronomy 19:21, and was given as a principle for the administration if civil law in Israel around 3500 years ago.
He took the life of an innocent girl, and therefore must forfeit his own life according to the principle of Lex Talionis.
Lex Talioni is spanish for the Law of Retaliation. The law of retaliation is the age old saying, "An eye for an eye, a tooth for a tooth". The prinicpal was orignally found in babylonian law. If a person was hurt the Injured person would take retrobution on tje one who did the crime. Tje crime could have been much wors eor even death
Lex talionis dictates:
A black eye for a black eye
a broken bone for a Broken Bone
A Broken spien you can'y go home