Along with Delta Cep, Zeta appears to be part of the Cepheus OB6 association (centered at 880 light years), an expanding group of massive stars that share a common birthplace.
Zeta Cephei (stars.astro.illinois.edu)Third magnitude (3.35) Zeta, notably brighter than Delta, lies with Epsilon Cephei in a little triangle at Cepheus’s southeastern corner.