The rim is broken by smaller craters along the south, north, and northwest sides, designated Messala B, J, and K, respectively.

Messala J has a narrow gouge in its eastern rim leading one crater diameter to the east.

It is attached to a slightly larger crater which lies across the southern rim of Schumacher.

Masha'allah was one of the most prominent members of the commission which decided for Caliph al-Mansur (A.D. 754–775) that the propitious moment for the founding of Baghdad fell on 30 July 762.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Messala.