Split Lie algebras are maybe the most known examples of graded Lie algebras. Since an important category in the class of
graded algebras is the category of strongly graded algebras, we introduce, in a natural way, the category of strongly split
Lie algebras $L$ and show that if $L$ is centerless, then $L$ is the direct sum of split ideals each of which is a split-simple
strongly split Lie algebra.
