Name «Tverdiata»

The name "Tverdiata" is formed using the suffix of childhood -yat(a) from one of the dual-root names, such as Tverdomyr, Tverdomysl, Tverdomyr, or Tverdoslav. These names contain the adjective "tverdyi" (meaning "firm" or "strong") as their first component. The first written mention of the name Tverdiata in Rus dates back to the year 1200. A document refers to the Kyiv boyar Roman Mstyslavich, who bore the name Tverdiata Ostromirich. He was an envoy to Tsargrad (Constantinople).The name Tverdiata, along with other names based on "Tverd-," was also used in Novgorod.