The first Muslim lady Hazrat Khadijah (RA) passed away on 10th Ramazan in the tenth year of Hijrah.
Soon after her death, the uncle and guardian of Hazrat Muhammd (PBUH), Abu Talib (AS) also died. The two lamps of their glorious lives were extinguished.
The Holy prophet was overwhelmed with sorrow. He called the year of their death as, “The Year of Sorrow” (Aa’m ul Hozn).