Dhu al-Qa'dah (Arabic: ذُو ٱلْقَعْدَة, Ḏū al-Qa ʿdah, IPA: [ðu‿l.qaʕ.dah]), also spelled Dhu al-Qi'dah or Zu al-Qa'dah, is the eleventh month in the Islamic calendar.

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Dhu al-Qadah
Anachronistic painting of a combat between Ali ibn Abi Talib (left) and Amr ibn Abd al-Wud (right) during the Battle of the Trench
Native name	ذُو ٱلْقَعْدَة (Arabic)
Calendar	Islamic calendar
Month number	11
Number of days	29-30 (depends on actual observation of the moon's crescent)
Significant days	Battle of the Trench Treaty of Hudaybiyyah
← Shawwal Dhu al-Hijja →

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It could possibly mean "possessor or owner of the sitting and seating place" - the space occupied while sitting or the manner of the sitting, pose or posture.

It is one of the four sacred months in Islam during which warfare is prohibited, hence the name "Master of Truces".

In Ottoman times, the name in Ottoman Turkish was Zi'l-ka'dé,^[1] abbreviation Za.^[2] In modern Turkish, it is Zilkade.

The most correct and most traditionally widespread transliteration of the month according to the thirteenth century Syrian jurist al-Nawawi is Dhu'l Qa'dah. Al-Nawawi also mentions that a smaller group of linguists allow the transliteration Dhu'l-Qi'dah, however.^[3] In modern times, it is most commonly referred to as Dhu'l Qi'dah although this is neither linguistically nor historically the strongest position.

The Islamic calendar is a lunar calendar, and months begin when the first crescent of a new moon is sighted. Since the Islamic lunar calendar year is 11 to 12 days shorter than the tropical year, Dhu'l-Qi'dah migrates throughout the seasons. The estimated start and end dates for Dhu'l-Qi'dah, based on the Umm al-Qura calendar of Saudi Arabia, are:^[4]

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• 5 AH, the Muslims took part in the Battle of the Trench.
• 6 AH, Truce of Hudaubiyah.
• 6 AH, Pledge of the Tree.
• 7 AH, The first pilgrimage - the return to Mecca for the performance of Umrah by Muhammad and his companions.
• 1 Dhu'l-Qi'dah, birth anniversary of Fātimah bint Mūsā.
• 1 Dhu'l-Qi'dah, Treaty of Hudaybiyyah.
• 8 Dhu'l-Qi'dah, Hajj was made incumbent upon Muslims in 8 AH.
• 11 Dhu'l-Qi'dah, birth anniversary of Imam Ali ibn Musa al-Ridha, the eighth Twelver Imam.
• 23 Dhu'l-Qi'dah, martyrdom of Imam Ali al-Ridha according to one tradition.
• 25 Dhu'l-Qi'dah, Arabic: يوم دحو الارض, the day earth was laid beneath the Ka'ba, and the birth date of Ibrahim and Jesus.
• 29 Dhu'l-Qi'dah, martyrdom of Imam Muhammad ibn Ali at-Taqi al-Jawad, the ninth Twelver Imam.