This passage from The Belgic Confession (1561, in Article 26) brings to mind “the only lover of mankind” as a way of referencing Jesus within many old prayers:
For neither in heaven nor among the creatures on earth is there anyone who loves us more than Jesus Christ does. Although he was “in the form of God,” Christ nevertheless “emptied himself,” taking “human form” and “the form of a slave” for us; and he made himself “like his brothers and sisters in every respect.” Suppose we had to find another intercessor. Who would love us more than he who gave his life for us, even though “we were enemies” And suppose we had to find one who has prestige and power. Who has as much of these as he who is seated at the right hand of the Father, and who has “all authority in heaven and on earth”?