Dragons additionally completed fifteenth in 2022-23 and final season.
In a press release Dragons stated: “We thank Dai for his contribution, professionalism, and dedication to Dragons RFC all through his time on the membership and want him and his household effectively for the longer term.”
Tiatia, who has been named interim head coach, will probably be “supported by the present teaching workers”.
Flanagan left his function as Scarlets backs coach to change into Dragons head coach in June 2022, when Dean Ryan was director of rugby.
Throughout Ryan’s protracted departure, which was finalised in January 2023, Flanagan took cost and remained in place from that time on.
Regardless of continued expressions of optimism that Dragons would change into extra aggressive – and occasional wins to savour – they continue to be the least profitable of the 4 skilled sides.
With the autumn internationals prompting a break in URC fixtures, Dragons are subsequent in motion in opposition to Cardiff at Rodney Parade on Saturday, 30 November (17:15 GMT).