post-Diana
/ˌpəʊs(t)dʌɪˈanə/adverb
Originally: after a significant event in the life of Diana, Princess of Wales, such as her coming to public notice, her separation and eventual divorce from Charles, Prince of Wales, or (now usually) her death.
adjective
1Following or occurring after the separation and eventual divorce of Charles, Prince of Wales and Diana, Princess of Wales.
2Occurring after, influenced by, or informed by the death of Diana, Princess of Wales (with reference to the national display of grief which it occasioned).
Origin
1990s; earliest use found in The Guardian. From post- + the name of Diana, Princess of Wales, former wife of Prince Charles; title before marriage Lady Diana Frances Spencer.