Brightest Cluster Galaxies (BCGs) are shaped by complex merging processes. The stellar population study of the intracluster light
(ICL) can shed light on the hierarchical assembly of galaxy clusters. In this talk I will present the stellar population properties of ICL
regions in the Coma cluster derived from modeling deep spectra obtained with SDSS/MaNGA, and discuss their implications on the
build-up of BCGs. I will also present analysis of VLT/MUSE data of an on-going BCG assembly in a galaxy cluster at z~0.1. Our results
reveal the coordinated assembly of BCGs, namely that the building blocks of BCGs are distinct from the general population of low mass
galaxies by their stellar population properties.
