Eventually Dido and her followers arrived on the coast of North Africa where Dido asked the Berber king Iarbas for a small bit of land for a temporary refuge until she could continue her journeying, only as much land as could be encompassed by an oxhide. They agreed. Dido cut the oxhide into fine strips so that she had enough to encircle an entire nearby hill, which was therefore afterwards named "Byrsa" "hide". (This event is commemorated in modern mathematics: The "isoperimetric problem" of enclosing the maximum area within a fixed boundary is often called the "Dido Problem" in modern calculus of variations.) That would become their new home. Many of the local Berbers joined the settlement and both Berbers and envoys from the nearby Phoenician city of Utica urged the building of a city. In digging the foundations an ox's head was found, indicating a city that would be wealthy but subject to others. Accordingly, another area of the hill was dug instead where a horse's head was found, indicating that the city would be powerful in war.