'Ispahan', also known as 'Pompon des Princes', is a clear pink, half-open kind of Damask rose (an early type, introduced from the Middle east in European breeding during the crusading 13th century).

David Austin still recommends it highly as free flowering, among the first Old Roses to start blooming and the last to continue, and for its fine Damask fragrance.
The name Ispahan is from the name of city of Isfahan

Isfahan (city)

Isfahan , historically also rendered in English as Ispahan, Sepahan or Hispahan, is the capital of Isfahan Province in Iran, located about 340 km south of Tehran. It has a population of 1,583,609, Iran's third largest city after Tehran and Mashhad...

 in Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

.

The flowers tend to grow in pairs.