095222

Observations of high-redshift (z>3) blazars offer glimpses into the first 1billion years of our Universe and enable us to study black hole growth and itsconnection to galaxy evolution. Blazars make up the most powerful class of AGNand their high luminosities enable us to study them across cosmic distances. Sofar not many sources have been studied since they generally appear faint andhigh quality data especially at X-ray energies requires large resources in theform of long observations. Using its all-sky survey capabilities the X-rayinstrument eROSITA has identified three new MeV blazar candidates (3<z<3.5) forwhich we ask for a total of 130ks observing time with NuSTAR and 26ks observingtime with XMM in order to confirm the blazar nature and model their broadband SED. [truncated! Please see actual data for full text]