Which Muslim pious caliph conquered Iran?

Which Muslim pious caliph conquered Iran?

کس مسلمان پرہیزگار خلیفہ نے ایران کو فتح کیا؟
Explanation

Umar was the second Muslim caliph (from 634),

Under whom Arab armies conquered Mesopotamia and Syria

And began the conquest of Iran and Egypt.


Additional information:

The Pious Caliphs were the first four Caliphs.

They were:

  •  Abu Bakr
  •  Umar
  •  Uthman
  •  Ali
Name (in Arabic)Born (CE)Reigned from (CE)DiedRelationship with MuhammadHouse
Abu Bakr (أبو بكر الصديق)5738 June 63222 August 634Father of Aisha,  Muhammad's wifeBanu Taim
Umar (عمر بن الخطاب)58423 August 6343 November 644 (assassinated by Abu Lu'lu'a Firuz)Father of Hafsa,  Muhammad's wifeBanu Adi
Uthman (عثمان بن عفان)57911 November 64420 June 656 (assassinated at the end of a siege upon his house; see First Fitna)Husband of Muhammad's daughters, Ruqayya and later Umm Kulthum, and grandson of Muhammad's paternal auntBanu Ummaya
Ali (علي بن أبي طالب)60120 June 656 29 January 661    (assassinated while praying in the Mosque of Kufa; see First Fitna)Muhammad's cousin, and husband of Fatimah, Muhammad's daughter and Umamah bint Zainab, Muhammad's granddaughterBanu Hashim