"... The masters of the German language lean towards the opinion that maintains that the word "Guisande" is of Visigothic origin. Guisande will therefore date from the time when the Visigoths, of Germanic origin, invaded the Iberian Peninsula from from the fifth century.
Dona Ermelinda Guterres, abbess of Rio Tinto, made a donation to the monastery of Grijó from a couple, which she inherited from her father, and which is located in the village called "Guisandi". The sentence of the inquisitions of 1288, given in 1290, says the following: «The quinta that was owned by Gotrim Perez and now there is the Abbess of Rio Tinto with all that village of Guisandi…»
The holder of Guisande, that is, the one under whose name or title the Church was founded, is S. Mamede, son of S. Teodoro and S. Rufina, descendants of illustrious knights and noble lineage. S. Mamede de Guisande has always belonged to the Ecclesiastical District of Feira which, for centuries, has belonged to the diocese of Porto..."
curious notes:
baptism records
1677-10-30/1911-03-31
marriage records
1676-08-24/1910-12-31
death records
1677-10-16/1911-03-16