Found the following hamletworks.org entries referring to line 3400

View Commentary Note for 3400
3400 {Imperious} <Imperiall> Cæsar dead, and turn'd to Clay, 34005.1.213

View Immaterial Textual Note for 3400
3400 {Imperious} <Imperiall> Cæsar dead, and turn'd to Clay, 34005.1.213

View Material Textual Note for 3400
3400 {Imperious} <Imperiall> Cæsar dead, and turn'd to Clay, 34005.1.213