Illustration from the Süleymanname, TSM Haz. 1517
f.367a, Detail of Suleiman at Qasr-i Shirin in Mesopotamia

A Solak leads 2 Peiks then the emperor who is flanked by 2 Solaks; 2 Silahtar in their red headgear and 3 Kapikulu cavalry follow.
From p.521, Chronicle of the World by Jerome Burne (Editor).

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The scene narrating Süleyman's 1533-34 campaign against the Safavids, during which the Ottomans captured Tabriz and Baghdad, ... the Sulaymānnāma shows him arriving at Qasr-i Shirin, a site associated with the palace of the Sassanian king Khusrau
p.270, Picturing History at the Ottoman Court By Emine Fetvaci