Dragons have signed Wales internationals Rhodri Williams and Ryan Bevington, plus Jordan Williams from Bristol for next season.
Ex-Ospreys loose-head prop Bevington, 28, won the last of his 15 caps against Italy in the 2014 Six Nations.
Scrum-half Rhodri Williams has been capped three times and like his fellow 24-year-old, utility back Jordan Williams, left Scarlets in 2016.
Dragons coach Bernard Jackman has said he wants 12 recruits for next season.
Rhodri Williams scored one of Wales' seven tries in their record 51-3 win over Scotland in the 2014 Six Nations championship.
Bristol confirmed the scrum-half's deal, with head coach Pat Lam paying tribute to Williams who has made 27 appearances for Bristol, touching down for seven tries.
"We're really pleased for Rhodri and he leaves with our blessing," he said.
"There's a fire burning inside Rhodri to represent his country again. We believe he's good enough to play for Wales and nothing will make me prouder than to see him pull on the red jersey"
It is understood British and Irish Lions tourist Ross Moriarty remains a major target for the Dragons.