BOSTON (AP) — The Boston Celtics have acquired point guard Isaiah Thomas from the Phoenix Suns for a first-round draft pick and guard Marcus Thornton.

The deal was made on a busy day at the NBA’s trading deadline.

Thomas, 26, is in the first year of a four-year, $27 million contract. He is averaging 15.2 points and 3.7 assists.

He spent his first three seasons with the Sacramento Kings. Last season he averaged more than 20 points and six assists per game.

The Celtics will send Phoenix the 2016 first-round pick they had acquired from Cleveland. Thornton heads to his fifth team in six NBA seasons. In 2011-12, he averaged 18.7 points per game.

Also Thursday, the Celtics sent Tayshaun Prince to the Detroit Pistons for Jonas Jerebko and Luigi Datome.

Prince is returning to the Detroit, where he began his career.

“Tayshaun Prince is certainly well known to fans in Detroit and we’re pleased to welcome him back,” Pistons President Stan Van Gundy said in a statement. “He fills a position of need for us at small forward with his offensive and defensive versatility. We thank both Jonas and Gigi for their hard work and wish them well going forward.”

Prince was part of Detroit’s championship team in 2004 and remained with the Pistons until 2013, when he was traded to Memphis. The Grizzlies dealt him to Boston last month, and now the 34-year-old returns to the franchise that drafted him in the first round in 2002. Prince is averaging 7.6 points this season.

Prince started 76 games for the Grizzlies last season, and although he’s been primarily a reserve for Memphis and Boston in 2014-15, he’s still averaging 23.6 minutes.