Al-ʿAskarīyayn (Arabic: العَسكَريَّين) refers to Imam al-Hadi (a) and Imam al-Hasan al-'Askari (a), 10th and 11th Shiite Imams (a). They are called "al-'Askariyayn" because they lived in Samarra which was the center of the Abbasid military base.
"Al-'Askar" means army or military base, and al-'Askari is an attribution to "'askar". Al-'Askariyayn is the two-fold form of al-'askari (meaning two people who are attributed to al-'askar (military base).
Samarra was for long an Abbasid military base. The Abbasid government forced Imam al-Hadi (a) and Imam al-Hasan al-'Askari (a) to live in Samarra for many years. The government inspected their lives and their communications with Shi'as. This is why they came to be called al-'Askariyayn.
They are both buried in Samarra. Their resting place is called the Shrine of al-'Askariyayn, and it is respected by Shi'as.
- Azharī, Thdhīb al-lugha, vol. 3, p. 194.
- Anwarī, Farhang-i buzurg-i sukhan, vol. 5, p. 5019.
- Suyūṭī, Tārīkh al-khulafāʾ, p. 335.
- Qummī, Munthī l-āmāl, vol. 3, p. 1873-1878, 1909.
- Anwarī, Ḥasan. Farhang-i buzurg-i sukhan. Tehran: Sukhan, 1381 Sh.
- Azharī, Muḥammad b. Aḥmad al-. Tahdhīb al-lugha. Beirut: Dār Iḥyāʾ al-Turāth al-ʿArabī, 1421 AH.
- Qummī, Shaykh ʿAbbās. Munthī l-āmāl. Edited by Nāṣir Bāqirī. Qom: Dalīl, 1379 Sh.
- Suyūṭī, Jalāl al-Dīn al-. Tārīkh al-khulafāʾ. Edited by Muhyī l-Dīn ʿAbd al-Ḥamīd. Cairo: n.p., 1371 AH.