Referencing ap Iorwerth, Millar says: “He told voters in May that the Senedd election was not about independence.
“Well, either he didn’t get his own memo or he deliberately chose to deceive people.
“Because just like the Pied Piper of Hamelin, the Plaid Piper of Anglesey has tried to hoodwink people.”
Miller describes the UK as “more than a political arrangement”, saying each helped to develop industries, abolish the slave trade, liberate Europe, and shape the modern world.
“We are a shared family of nations. For centuries, the people of Wales, England, Scotland and Northern Ireland have lived together, worked together, and traded together.
“Of course, there are those on the left who say we should apologise or be embarrassed about our history.
“But I say that it is a legacy and a heritage that we should be proud of and use to inspire the next generation.”
The Shadow Welsh Secretary branded a recent meeting of the first ministers of Wales, Scotland and Northern Ireland a “separatist summit”.
Mims Davies was speaking at a discussion on the union at Conservative party conference in Birmingham.
She also claimed the Plaid Cymru Welsh government could not afford its flagship childcare policy.
“That has meant that families have been sold a pup,” said Davies.
“It feels that if you’re living in Wales, life is far too hard, and there is nobody really standing up for the people of Wales,” the MP told delegates.