Evliya Çelebi informs us that Halkalı Garden was built by Sinan during the reign of Süleyman I, and lists it as one of the forty imperial gardens.
Source: Travel Account, 17th century
Evliya Çelebi Seyahatnâmesi: Topkapı Sarayı Bağdat 304 Yazmasının transkripsiyonu (Open in Zotero)
Originally published at: Atasoy, Nurhan, and Seyit Ali Kahraman “Halkalı Garden.” Middle East Gardens Traditions. Dumbarton Oaks, December 1, 2014. https://www.doaks.org/resources/middle-east-garden-traditions/catalogue/C98. Archived at: https://perma.cc/5UDZ-R9BM.