Large CP Violation, Large Mixings of Neutrinos and the $Z_3$ Symmetry

We present neutrino mass matrices which predict the atmospheric neutrino mixing to be almost maximal, ${\sin }^{2}2{\theta }_{atm}>0.999$, as well as the large solar neutrino mixing, $8\mathrm{/}9>{\sin }^{2}2{\theta }_{sol}>0.87$, and the large CP violation (the CP violation phase in the standard form is maximal $\delta =\pi \mathrm{/}2$), based on the $Z_3$ symmetry.