Sengakuji Temple is the famous resting place of the 47 Ronin ( samurai with no lord or master).

47 Ronin Story
Sengakuji temple’s fame comes from the 47 Ronin and their story which you can read below;
The story of the 47 Ronin is about a group of samurai who had lost their leader ( daimyo) because he was forced commit seppuku (Suicide) for attacking a court official named Kira Yoshinaka. The 47 Ronin wished to avenge their masters honor, so they waited and prepared for one year and a half until December 14th 1702 until they could finally get their chance to kill Kira. After killing Kira the Samurai brought Kira’s head to Sengakuji. The 47 ronin were sentenced to commit seppuku for the murder of Kira. The grave of 47 ronin is now at Sengakuji temple along with their armor. Every December 14th a festival takes place in memory of the 47 ronin at Sengakuji, which usually gets thousands of attendee’s.
The story of the 47 Ronin is popular in Japan because it symbolizes loyalty, persistence, honor and sacrifice.
Location
The temple is located right beside Sengakuji station. You can also take a short walk from Shinagawa station. From Tokyo you can use the JR Yamanote line to get to either Sengakuji station or Shinagawa station.
Working hours & admission
The temple is open from 7:00 to 18:00 and is open every day of the week. There is no admission fee.