Abstract
In this paper, we consider a nonlinear multi-term Caputo fractional differential equation with nonlinearity depending on the unknown function together with its lower-order Caputo fractional derivatives and equipped with Riemann-Stieltjes integro multipoint boundary conditions. The given problem is transformed to an equivalent fixed point problem, which is then solved with the aid of standard fixed point theorems to establish the existence and uniqueness results for the problem at hand. Examples are constructed for the illustration of the obtained results.