Blanton spent the first four years of his career with the Minnesota Vikings, where he recorded 199 total tackles and one interception.
After starting 13 games in 2014, Blanton looked poised to see more starting time in Minnesota in 2015, but he was placed behind Andrew Sendejo before the start of the regular season.
He started just one game last season and recorded 27 total tackles with three passes defended.
Buffalo was in search of some depth at the safety position, as Bacarri Rambo is still out on the free-agent market. The Bills didn't necessarily have a bad pass defense last season—they were ranked 14th in the league—but with the possibility of losing Rambo looking like it would become a reality, Blanton provides some insurance.
ESPN.com's Mike Rodak broke down where Blanton will fit in Buffalo's secondary:
Mike Rodak @mikerodak
Robert Blanton projects as No 3 safety, replacing Bacarri Rambo. Not great news for Duke Williams or Jonathan Meeks, who could be on bubble.2016-3-18 18:14:00
The Bills got their man quickly, as Blanton visited the team earlier Friday before inking a deal. Per Bills PR, he will rejoin fullback Jerome Felton, who was a teammate of his in Minnesota from 2012 to 2014:
jerome felton @jfelton45
My guy @BlantonRobert in the house today @buffalobills all he needs is a opportunity!!! Hope the visit goes well!2016-3-18 14:41:20
Blanton will likely be behind Corey Graham, who had 122 total tackles and two interceptions, and Aaron Williams, who is looking to come back from a 2015 season that was cut short by 13 games due to a neck injury.
That, as Rodak alluded to, could spell trouble for Duke Williams and Jonathan Meeks. Willams started four games last season with 23 total tackles, while Meeks spent most of his time on special teams.
Blanton will be able to cycle in to Buffalo's secondary among Graham and Aaron Williams and contribute to the Bills defense. If anything were to happen to either of those two, especially with Williams' recent injury troubles, then Blanton would be the next man up.
Stats courtesy of Pro-Football-Reference.com.