Princess Lilian was "a credit to Swansea", her first cousin Barbara Davies, who was also born in the city, told ITV News.
"She had an exciting life. While living in Stockholm, she did have a degree of privacy."
"From my conversations with people in Sweden they were in high praise of her conduct."
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RSPCA says one budgie was put to sleep and another survived after their cage was left in a road in Swansea. A pet snake was also left.
Timothy Edward King claimed to hear voices and blamed the blaze it on his alter-ego who he said was out of control.