  We review the theoretical underpinnings, evolutionary status, calibrations
and current applications of three bright Population II extragalactic distance
indicators: Tip of the Red Giant Branch (TRGB) stars, RR Lyrae variables and
J-Branch Asymptotic Giant Branch (JAGB/Carbon) stars. For M_I (TRGB) = -4.05
mag the Hubble constant is determined to be Ho = 69.8 +/- 0.6 (stat) +/-1.6
(sys) km/s/Mpc.
