This term corresponds to definition 1.
There are multiple definitions - click on the translation that matches your context.
someone or something that receives a position, title, political power, or property etc that is left or handed down by someone who owned it before. NB In this meaning of the word legatee/i> the term successor is more common.
She is the obvious political legatee to the current Prime Minister.
someone who receives a share of someone else's property after they die
Actions filed by the legatee concerning property must be filed within eight years of the death of the deceased.