Around November 16, 1572, it reached its peak brightness at about magnitude −4.0, with some descriptions giving it as equal to Venus when that planet was at its brightest. The supernova remained visible to the naked eye into early 1574, gradually fading until it disappeared from view.Wiki gives SN 1054's peak apparent magnitude at -6.0, bright enough to see in daylight.
I think Kepler also saw a supernova, after Tycho’s death, but I don’t remember where in the sky it was visible.