That's a fine old hymn!

This one is more appropriate for our time. We in Ireland sing it after Mass occasionally and on his feast day 17th March.

St Patrick Christianised Ireland, driving all the snakes out of the Island.
The Shamrock is a three leafed clover (the triune God) without any white marks on it.

Hail, Glorious St Patrick

Hail, glorious Saint Patrick, dear saint of our Isle,
 On us thy poor children bestow a sweet smile;
 And now thou art high in the mansions above,
 On Erin's green valleys look down in thy love.

On Erin's green valleys, on Erin's green valleys,
 On Erin's green valleys look down in thy love.

Hail, glorious Saint Patrick, thy words were once strong
 Against Satan's wiles and an infidel throng;
 Not less is thy might where in heaven thou art;
 O, come to our aid, in our battle take part.

On Erin's green valleys, on Erin's green valleys,
 On Erin's green valleys look down in thy love.

In the war against sin, in the fight for the faith,
 Dear saint, may thy children resist unto death;
 May their strength be in meekness, in penance, their prayer,
 Their banner the cross which they glory to bear.

On Erin's green valleys, on Erin's green valleys,
 On Erin's green valleys look down in thy love.

Thy people, now exiles on many a shore,
 Shall love and revere thee till time be no more;
 And the fire thou hast kindled shall ever burn bright,
 Its warmth undiminished, undying its light.

On Erin's green valleys, on Erin's green valleys,
 On Erin's green valleys look down in thy love.

Ever bless and defend the sweet land of our birth,
 Where the shamrock still blooms as when thou wert on earth,
 And our hearts shall yet burn, wherever we roam,
 For God and Saint Patrick, and our native home.

On Erin's green valleys, on Erin's green valleys,
On Erin's green valleys look down in thy love.

Words by Sister Agnes