A definite line was drawn between the two continents by the geographer Ptolemy (85 - 165 AD), indicating Alexandria along the Prime Meridian and making the isthmus of Suez and the Red Sea the boundary between Asia and Africa.
This beast of burden was first brought to Egypt by the Persians after 525 BC, although large herds did not become common enough in North Africa to establish the trans-Saharan trade until the eighth centuryAD.
The Sanhaja Berbers were the first to exploit this, and after the spread of Islam a steady trade in precious metals, ivory, salt and slaves ensued between the Muslim states in the Maghreb and the Sahelian kingdoms.
The distinction between sins that could be forgiven and others that could not, originated in the latter half of the second century as the doctrine of the Montanists (q.v.), and especially of Tertullian.
While still a Catholic, Tertullian wrote (A.D. 200-6) his "De poenitentia" in which he distinguishes two kinds of penance, one as a preparation for baptism, the other to obtain forgiveness of certain grievous sins committed after baptism, i.e., apostasy, murder, and adultery.