“Triduana’s themes are banishing, health and protection. Her symbols are water and oak. In Scotland, this Goddess rules over sacred water sources, from which She selflessly gives Her elixir to all who ask in humility. Many of Her wells are said to dwell beneath oak trees, ancient symbols of protection and well-being.
Since the 1800’s, people have been coming to Loch mo Naire around this time of year to heal their body, mind or spirit. People sip a bit of the water and bathe in it three times, giving an offering of silver coins to the generous water spirit there. For us this means drinking eight glasses of water today, as is often recommended by physicians for improved health. This helps flush our toxins and draws Triduana’s healing energy into our bodies.
Another custom easily followed is that of taking off one’s clothes and walking backward to banish sickness. Both of these actions symbolize a turning away or a change. If possible, choose clothing you don’t need anymore, take it off, throw it out, then walk backward to a place where you can put on fresh clothing and don Triduana’s blessings!
Interestingly enough oak leaves have long been considered excellent health charms. If you can catch one before it touches the earth, you ensure yourself of Triduana’s protection and a month without colds.”
(Patricia Telesco, “365 Goddess: a daily guide to the magic and inspiration of the goddess”.)
“According to the 16th-century Aberdeen Breviary, Triduana was born in the Greek city of Colosse, and travelled from Constantinople with Saint Rule, who brought the bones of Saint Andrew to Scotland in the 4th century AD. A pious woman, she settled at Rescobie near Forfar in Angus, but her beauty attracted the attentions of a King of the Picts named Nectan. To stall these unwanted attentions, Triduana tore out her own eyes and gave them to Nechtan. Afterwards, she was associated with curing eye disorders. She spent her later years in Restalrig, Lothian, and healed the blind who came to her. She was buried at Restalrig when she died.
The 17th-century Acta Sanctorum records a story of a blind English woman miraculously cured by Triduana. The saint appears to her in a dream, and instructs her to travel to Restalrig. She does so, and regains her sight at Triduana’s tomb. The woman’s daughter is later cured of blindness after praying to Triduana.
In the 12th century, the Norse Earl of Orkney Harald Maddadsson punished bishop John of Caithness by having him blinded. According to the 13th-century Orkneyinga Saga, John prayed to ‘Trøllhaena’, and later regained his sight when brought to her ‘resting place’, possibly referring to a local northern shrine rather than Restalrig.
The principal centre of devotion to Triduana was at Restalrig, now part of Edinburgh, where the parish church is dedicated to her. The 15th-century St Triduana’s Aisle often flooded in the past, and was though to be a holy well, known as St Triduana’s Well. The aisle was heavily restored by the architect Thomas Ross in 1907. Other dedications to Triduana include chapels at Ballachly (Caithness), Loth (Sutherland), and on Papa Westray in Orkney.” 
Monaghan, Patricia. The New Book of Goddesses and Heroines, “Triduana”.
Catholic.org, “St. Triduana“.
Foster, John. “The Legend and Shrine of Saint Triduana“.
Saintwiki.com, “Barrett/Scottish Saints/St. Triduana“.
Scottish-places.info, “Overview of St Triduana’s Well“.