Today's historic meeting stems from the need to maintain cooperation between neighboring countries and Iraq, he said.
The summit was headed by Speaker of Iraq's Council of Representatives, Mohammed al-Halbusi.
Scarred by more than three decades of war, Iraq is recasting itself as a mediator among neighbours who are often at odds over weighty issues, including the civil war in Syria and U.S. sanctions against Iran.
Iran's Parliament speaker Ali Larijani is represented by MP Alaeddin Boroujerdi, the former chairman of the chamber's National Security and Foreign Policy Committee.
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On the other hand, Iraq is leveraging its position in the middle of a tug-of-war between Iran and its detractors.
"This is a positive message to all neighbouring countries and the world that Iraq is determined to regain its health and return to its Arab, regional environment and assume its rightful place in the map of the balance of power", Bashir Haddad, deputy parliamentary speaker said.
Top officials from Iraq's six neighbours gathered in its capital Saturday for a symbolic summit showcasing Baghdad's aspirations as a regional mediator, but which otherwise produced no tangible outcome.
Saudi Arabia and Iran severed diplomatic ties with one another in 2016 and are locked in proxy wars across the region. It is unusual for Saudi and Iranian officials to attend the same events.
Iraq's Prime Minister Adil Abdul-Mahdi recently visited both Iran and Saudi Arabia where he met with senior officials in both countries to discuss bilateral ties and further strengthen Baghdad's relationship with its neighbors.