Passage: The king cobra was described and drawn by the Danish naturalist Theodore Edward Cantor in 1836, who gave it the scientific name Hamadryas hannah. Cantor had three specimens from the Sundarbans and one caught in the vicinity of Kolkata. It was moved to its own genus Ophiophagus by Albert Günther in 1864. A 2016 genetic analysis showed that the king cobra was an early offshoot of a lineage giving rise to the mambas, rather than the other cobras.Ophiophagus hannah belongs to the monotypic genus Ophiophagus in the family Elapidae, while most other cobras are members of the genus Naja. They can be distinguished from other cobras by size and hood. King cobras are generally larger than other cobras, and the stripe on the neck is a chevron instead of a double or single eye shape that may be seen in most of the other Asian cobras. Moreover, the hood of the king cobra is narrower and longer. A key to identification, clearly visible on the head, is the presence of a pair of large scales known as occipitals, located at the back of the top of the head. These are behind the usual "nine-plate" arrangement typical of colubrids and elapids, and are unique to the king cobra.

Question: Mambas are related to which creature?
king cobra