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The 'flag of Trondheim' is one of the official symbols of the city and municipality of Trondheim in Norway.
Most Norwegian municipalities have a banner of their respective coats of arms as a flag. As Trondheim has no heraldic coat of arms, but only a seal that is unsuitable as a banner of arms, a yellow "Trondheim rose" on a red field was instead chosen for the flag of Trondheim. The designer of the flag was professor Arne E. Holm, whose proposal was approved by the municipal council in 1989, and confirmed by royal order the same year.
The dog rose is the official flower of the city and its stylised form is related to the Tudor rose.
It is found as a symbol in medieval sources among other things representing St. Olav. This flower has been used as a symbol of the city at least since the 16th century. It is earliest preserved in the seal of the church chapter of Trondheim used in the 1500s. In the 1600s it was used on a green field in the banner of the citizen guard of the city. It has also been used as a symbol of several guilds such as the masons, bakers, goldsmiths and smiths. In the 1700s the flower replaced the three heads in the seal of Trondheim. The idea of the rose as a symbol of Trondheim may originally have come into being because of a misinterpretation of the last syllable of the city's old name Nidaros.
The flower has been so closely connected to Trondheim that the Norwegian heraldic authority denied other municipalities the use of it in their coats of arms.

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Sources

Sources

★ Trondheim municipality page on the Trondheim rose

★ Trondheim municipality page on the flag