Answer

The Bhaktamar Stotra is traditionally attributed to Acharya Manatunga, and modern Jain scholarship generally places him in the second half of the 6th century CE. The exact year is not known with certainty. ( jainpedia.org)

Explanation

Jainpedia notes that historical information about Manatunga is scarce and that his date remains a matter of hypothesis or controversy. Some traditions and secondary sources place him differently, but the commonly accepted scholarly view is the 6th century CE. ( jainpedia.org)

Spiritual Understanding

In Jain Dharma, the spiritual merit and devotional power of the Bhaktamar Stotra are more important than the precise historical date. It is revered as a powerful hymn dedicated to Ṛṣabhanātha, also known as Ādinātha. ( jainpedia.org)

Takeaway

In simple terms: Bhaktamar Stotra was composed by Acharya Manatunga, most commonly dated to the 6th century CE. ( jainpedia.org)