Bummer nothing on Tertullian.
*** w92 4/1 p. 28 Part 3—Did the Apologists Teach the Trinity Doctrine? ***
Tertullian (c. 160 to 230 C.E.) was the first to use the Latin word trinitas. As noted by Henry Chadwick, Tertullian proposed that God is ‘one substance consisting in three persons.’ 25 This does not mean, however, that he had in mind three coequal and coeternal persons. However, his ideas were built upon by later writers who were working toward the Trinity doctrine.
Tertullian’s concept of Father, Son, and holy spirit was a far cry from Christendom’s Trinity, for he was a subordinationist. He viewed the Son as subordinate to the Father.