The "Lion of Judah" has been a popular symbol ot the Juewish people harkening back to the lion as a symbol for the tribe of Judah, to his descendant David, and to the Messiah who will come from the House of David. It has come to represent strength, courage, justice, spiritual fortitude, and wisdom, and adorned both Solomon's throne and the Temple.
In Genesis the patriarch Jacob refers to his son Judah as a "Young Lion" (Genesis 49:9) when blessing him. (The lion is a symbol of power)
Today you can find the Lion in the seal of Jerusalem together with olive leafs (the symbol of peace) and the Wailing Wall.