Catacomb art does not reveal His life, but His Divinity. As for Yahweh in the Hebrew Scriptures, so for Jesus, God is not named nor shown but alluded to by signs sketched on funerary slabs, sarcophagi, and in fresco. The earliest Christian art evolved, according to Neil MacGregor in his work, SEEING SALVATION, in a milieu suspicious of imagery
One of the earliest symbols used is that of the FISH.
Tertullian, a second century theologian writes:
‘We little fishes [pisciculi], after the image of our ICHTHYS Jesus Christ, are born in the water, nor otherwise than swimming in the water are we safe.’