Sima Dan

Biography & Historical Record

Sima Dan (司马诞, Tư Mã Đản) was a son of Sima Fang (司马防, Tư Mã Phòng) and a younger brother of Sima Yi (司马懿, Tư Mã Ý) in the celebrated roster of the Eight Sons of Sima Fang (司马八达). Fifth son; courtesy Xianda (显达).

Fifth son; courtesy Xianda (显达, Hiển Đạt). Chen Shou’s core Sanguozhi text foregrounds Sima Yi (司马懿, Tư Mã Ý), Sima Lang (司马朗), and Sima Fu (司马孚); Sima Dan (司马诞, Tư Mã Đản) appears in the Jin-era genealogical layer as one of the Eight Sons of Sima Fang (司马八达) — eight brothers whose courtesy names all end in da (达, Đạt).

The brothers shared the Wen County pedigree and Han–Wei service culture while only Sima Yi, Sima Lang, and Sima Fu drew extended notice in Chen Shou and Pei Songzhi. This page marks the brother for Family wiki links on Sima Yi’s clan tree.

Role in Romance of the Three Kingdoms

Not a major Romance character. The Eight Sons are a historical genealogical set; the novel follows Sima Yi’s rise.

Sima Dan — Historical & Literary Timeline

Key Relationships

Family

• Father Sima Fang (司马防, Tư Mã Phòng) — Eastern Han official; patriarch of the Eight Sons of Sima Fang (司马八达).
• Mother Wife of Sima Fang (司马防之妻, Vợ Tư Mã Phòng) — unnamed in Sanguozhi; mother of all eight brothers.
• Elder brothers Sima Lang (司马朗, Tư Mã Lãng) (Boda 伯达) and Sima Yi (司马懿, Tư Mã Ý) (Zhongda 仲达).
• Eight Sons roster: Sima Kui (司马馗) (Shuda), Sima Jun (司马均) (Jida), Sima Dan (司马诞) (Xianda), Sima Zhao (brother) (司马昭) (Yingda — not son Sima Zhao), Sima Xun (司马恂) (Jingda), Sima Fu (司马孚) (Youda, youngest).

Friends

• No named companions in Sanguozhi or the novel for this brother; the Eight Sons are a genealogical set, not a speaking fraternity in Luo Guanzhong.

Enemies

• No personal enemies named in the core record for this figure.

Other

• Not Sima Dan who rebelled as Wei general (same name, different lineage page). Eight Sons genealogical brother only.