The variety is associated with the name of Ferenc Király, who created this crossing of Ezerjó and Bouvier in Pécs in 1951. It was registered in the national variety catalogue in May 1976. Initially, it was known as Badacsony 7.
It is another one of the five varieties beginning with "z" that Ferenc Király bred by crossing Ezerjó and Bouvier. Zengő was named after the highest peak of the Mecsek Hills, but the literature does not mention how Zenith got its name; however, it means apex in the both the figurative sense and in astronomy. Perhaps this is the most obvious explanation for the variety's name.
Today, it is grown on 705 hectares in Hungary and is the most widespread in the Balatonboglár, Bükk and Etyek-Buda wine districts. The majority of plantings can be found in the Mátra wine district, but small amounts can basically be found all around the country.
It thrives on volcanic soils and so feels right at home around the Balaton, with some producers in the Balaton Highlands taking the variety very seriously. Its fresh acidity is in balance with the rest of the wine, so the wines are harmonious and delicately aromatic in style. The neutrality and high acidity of Ezerjó pairs well with Bouvier's floral, perfumed style. It is a relatively good sugar pump, resulting in full-bodied wines in the right hands.
The variety undeniably boasts perfumed and floral notes. A touch of residual sugar complements its fresh acidity. It is characterised by green apple, elderflower, candied pear, delicate spice, peppermint and restrained perfume. It is often found in off-dry styles where its high acidity is balanced by a ripe, fruity style, together with moderate alcohol and body.