Valmiki Ramayana Kishkindha Kanda Sarga 17 Shloka 18

राजन् O king, दमः selfcontrol, शमः control of mind, intellect, memory and ego क्षमा tolerance, धर्मः righteousness, धृतिः forbearance, सत्यम् truthfulness, पराक्रमः valour, अपराधिषु towards the offenders, दण्डश्च punishment, पार्थिवानाम् for king's, गुणाः virtues

'O king selfcontrol (of organs of action and sense organs), righteousness, steadfastness, truthfulness, valiance and capacity to punish the offenders are virtues of a king.