  A rather clear problem has remained in black hole physics: localizing black
holes. One of the recent theoretical ways proposed to identify black hole
mergers' hosts is through multi-messenger gravitational lensing: matching the
properties of a lensed galactic host with those of a lensed gravitational wave.
This paper reviews the most recent literature and introduces some of the
ongoing work on the localization of binary black holes and their host galaxies
through lensing of gravitational waves and their electromagnetically-bright
hosts.
