Text ( visual ) : unmediated Instruction for a ruler = De principis instructione / Gerald of Wales ; edited and translated by Robert Bartlett. -- Oxford : Clarendon Press , 2018. -- lxviii, 801 p. : ill. ; 23 cm. -- (Oxford medieval texts). -- Includes bibliographical references (p. [735]-750) and indexes. -- ISBN 9780198738626 ; (BB26472560) ; https://ci.nii.ac.jp/ncid/BB26472560 Other Title(s): Gerald of Wales : Instruction for a ruler. -- Author Heading(s): Giraldus, Cambrensis ; Bartlett, Robert. -- Classification(s): LCC : DA206 ; DC23 : 942.03092 ; DC23 : 878.03. -- Subject Heading(s): LCSH : Giraldus, Cambrensis, 1146?-1223? De instructione principum ; LCSH : Education of princes -- Early works to 1800 ; LCSH : Great Britain -- History -- Henry II, 1154-1189 -- Sources ; LCSH : Great Britain -- History -- Angevin period, 1154-1216 -- Sources ; LCSH : Henry II, King of England, 1133-1189 -- Early works to 1800 ; LCSH : Kings and rulers, Medieval -- Conduct of life -- Early works to 1800 ; LCSH : Europe, Western -- History -- To 1500 -- Early works to 1800