  The field of high-energy neutrino astronomy is undergoing a rapid evolution.
After the discovery of a diffuse flux of astrophysical TeV-PeV neutrinos in
2013, the IceCube observatory has recently found first compelling evidence for
neutrino emission from blazars. In this brief review, I will summarize the
status of these neutrino observations and highlight the strong role of
multi-messenger astronomy for their interpretation.
